|| As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.
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Conspire is a keyword ability that allows the spell played to be copied if you tap two untapped creatures that share a color with that spell. Conspire was introduced in Shadowmoor.  By 2010, it was considered a design failure. 
From the Comprehensive Rules (Khans of Tarkir)
- 702.77. Conspire
- 702.77a Conspire is a keyword that represents two abilities. The first is a static ability that functions while the spell with conspire is on the stack. The second is a triggered ability that functions while the spell with conspire is on the stack. "Conspire" means "As an additional cost to cast this spell, you may tap two untapped creatures you control that each share a color with it" and "When you cast this spell, if its conspire cost was paid, copy it. If the spell has any targets, you may choose new targets for the copy." Paying a spell’s conspire cost follows the rules for paying additional costs in rules 601.2b and 601.2e–g.
- 702.77b If a spell has multiple instances of conspire, each is paid separately and triggers based on its own payment, not any other instance of conspire.
From the Comprehensive Rules (Khans of Tarkir)
- 601.2b If the spell is modal the player announces the mode choice (see rule 700.2). If the player wishes to splice any cards onto the spell (see rule 702.46), he or she reveals those cards in his or her hand. If the spell has alternative or additional costs that will be paid as it's being cast such as buyback or kicker costs (see rules 117.8 and 117.9), the player announces his or her intentions to pay any or all of those costs (see rule 601.2e). A player can't apply two alternative methods of casting or two alternative costs to a single spell. If the spell has a variable cost that will be paid as it's being cast (such as an in its mana cost; see rule 107.3), the player announces the value of that variable. If a cost that will be paid as the spell is being cast includes hybrid mana symbols, the player announces the nonhybrid equivalent cost he or she intends to pay. If a cost that will be paid as the spell is being cast includes Phyrexian mana symbols, the player announces whether he or she intends to pay 2 life or the corresponding colored mana cost for each of those symbols. Previously made choices (such as choosing to cast a spell with flashback from a graveyard or choosing to cast a creature with morph face down) may restrict the player's options when making these choices.
- 601.2e The player determines the total cost of the spell. Usually this is just the mana cost. Some spells have additional or alternative costs. Some effects may increase or reduce the cost to pay, or may provide other alternative costs. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. The total cost is the mana cost or alternative cost (as determined in rule 601.2b), plus all additional costs and cost increases, and minus all cost reductions. If the mana component of the total cost is reduced to nothing by cost reduction effects, it is considered to be . It can't be reduced to less than . Once the total cost is determined, any effects that directly affect the total cost are applied. Then the resulting total cost becomes "locked in." If effects would change the total cost after this time, they have no effect.
- 601.2f If the total cost includes a mana payment, the player then has a chance to activate mana abilities (see rule 605, "Mana Abilities"). Mana abilities must be activated before costs are paid.
- 601.2g The player pays the total cost in any order. Partial payments are not allowed. Unpayable costs can't be paid.
Example: You cast Altar's Reap, which costs and has an additional cost of sacrificing a creature. You sacrifice Thunderscape Familiar, whose effect makes your black spells cost less to cast. Because a spell's total cost is "locked in" before payments are actually made, you pay , not , even though you're sacrificing the Familiar.
- If you choose to pay a conspire cost of a multicolored spell, the two creatures you tap don't need to share a color with each other. Each one just needs to share a color with the spell that has conspire.
- You may pay a spell's conspire cost only once. (If a spell has multiple instances of conspire, you may pay each conspire cost only once.)
- A copy created with conspire will have a conspire ability itself. However, since that copy wasn't played, its conspire ability won't trigger. You won't get another copy.
- The copy you create with conspire is separate from the original spell. If either one of them is countered, the other remains on the stack.
- If conspire's triggered ability is countered (by the Scourge spell Stifle, for example), no copy will be created. The original spell will be unaffected.
- Æthertow -
Put target attacking or blocking creature on top of its owner's library.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)
Creature that grants Conspire