Regal Leosaur

one red mana one white mana Creature — Dinosaur CatPower and toughness2/2

Mutate one generic mana one red or white mana (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Whenever this creature mutates, other creatures you control get +2/+1 until end of turn.

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Regal Leosaur rulings

2020-04-17
Regal Leosaur’s last ability affects only other creatures you control at the time it resolves. Creatures you begin to control later in the turn won’t get +2/+1.

Regal Leosaur keyword rules

Mutate Rule 702.140

Mutate appears on some creature cards. It represents a static ability that functions while the spell with mutate is on the stack. “Mutate [cost]” means “You may pay [cost] rather than pay this spell’s mana cost. If you do, it becomes a mutating creature spell and targets a non-Human creature with the same owner as this spell.” Casting a spell using its mutate ability follows the rules for paying alternative costs (see and –h).

As a mutating creature spell begins resolving, if its target is illegal, it ceases to be a mutating creature spell and continues resolving as a creature spell and will be put onto the battlefield under the control of the spell’s controller.

As a mutating creature spell resolves, if its target is legal, it doesn’t enter the battlefield. Rather, it merges with the target creature and becomes one object represented by more than one card or token (see rule , “Merging with Permanents”). The spell’s controller chooses whether the spell is put on top of the creature or on the bottom. The resulting permanent is a mutated permanent.

An ability that triggers whenever a creature mutates triggers when a spell merges with a creature as a result of a resolving mutating creature spell.

A mutated permanent has all abilities of each card and token that represents it. Its other characteristics are derived from the topmost card or token.

Any effect that refers to or modifies the mutating creature spell refers to or modifies the mutated permanent it merges with as it resolves.