Lethal Scheme

two generic mana one black mana Instant

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for one generic mana or one mana of that creature's color.)

Destroy target creature or planeswalker. Each creature that convoked this spell connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

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Lethal Scheme rulings

2024-01-12
When calculating a spell's total cost, include any alternative costs, additional costs, or anything else that increases or reduces the cost to cast the spell. Convoke applies after the total cost is calculated. Convoke doesn't change a spell's mana cost or mana value.
2024-01-12
If a creature you control has a mana ability with in the cost, activating that ability while casting a spell with convoke will result in the creature being tapped before you pay the spell's costs. You won't be able to tap it again for convoke. Similarly, if you sacrifice a creature to activate a mana ability while casting a spell with convoke, that creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for convoke.
2024-01-12
Tapping a multicolored creature using convoke will pay for or one mana of your choice of any of that creature's colors.
2024-01-12
You can tap any untapped creature you control to convoke a spell, even one you haven't controlled continuously since the beginning of your most recent turn.
2024-01-12
Tapping an untapped creature that's attacking or blocking to convoke a spell won't cause that creature to stop attacking or blocking.
2024-01-12
Because convoke isn't an alternative cost, it can be used in conjunction with alternative costs.
2022-04-29
You can't tap more creatures to convoke Lethal Scheme than it takes to pay for its total cost. This means that normally no more than four creatures can convoke it.
2022-04-29
Once an ability that causes a creature to connive begins to resolve, no player may take any other actions until it's done. Notably, opponents can't try to remove the conniving creature after you discard a nonland card but before it receives a counter.
2022-04-29
If no card is discarded, most likely because that player's hand is empty and an effect says they can't draw cards, the conniving creature does not receive a +1/+1 counter.
2022-04-29
When multiple creatures are instructed to connive simultaneously, they connive one at a time in the order of their controller's choice.
2022-04-29
If a resolving spell or ability instructs a specific creature to connive but that creature has left the battlefield, the creature still connives. If you discard a nonland card this way, you won't put a +1/+1 counter on anything. Abilities that trigger "when [that creature] connives" will trigger.

Lethal Scheme keyword rules

Connive Rule 701.47

Certain abilities instruct a permanent to connive. To do so, that permanent’s controller draws a card, then discards a card. If a nonland card is discarded this way, that player puts a +1/+1 counter on the conniving permanent.

A permanent “connives” after the process described in rule is complete, even if some or all of those actions were impossible.

If a permanent changes zones before an effect causes it to connive, its last known information is used to determine which object connived and who controlled it.

If multiple permanents are instructed to connive at the same time, the first player in APNAP order who controls one or more of those permanents chooses one of them and it connives. Then if any permanents remain on the battlefield which have been instructed to connive and have not done so, this process is repeated.

Connive N is a variant of connive. The permanent’s controller draws N cards, discards N cards, then puts a number of +1/+1 counters on the permanent equal to the number of nonland cards discarded this way.

Convoke Rule 702.51

Convoke is a static ability that functions while the spell with convoke is on the stack. “Convoke” means “For each colored mana in this spell’s total cost, you may tap an untapped creature of that color you control rather than pay that mana. For each generic mana in this spell’s total cost, you may tap an untapped creature you control rather than pay that mana.”

The convoke ability isn’t an additional or alternative cost and applies only after the total cost of the spell with convoke is determined.

A creature tapped to pay for mana in a spell’s total cost this way is said to have “convoked” that spell.

Multiple instances of convoke on the same spell are redundant.