Tributary Instructor

three generic mana one green mana Creature — Merfolk ShamanPower and toughness4/4

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Whenever a creature you control with a +1/+1 counter on it dies, draw a card.

"Like water between rivers, wisdom must flow freely from one generation to the next."

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Showing The Lost Caverns of Ixalan Commander#96

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Tributary Instructor rulings

2023-11-10
Mentor compares the power of the creature with mentor with that of the target creature at two different times: once as the triggered ability is put onto the stack, and once as the triggered ability resolves. If you wish to raise a creature's power so its mentor ability can target a bigger creature, the last chance you have to do so is during the beginning of combat step.
2023-11-10
If the target creature's power is no longer less than the attacking creature's power as the ability resolves, mentor doesn't add a +1/+1 counter. For example, if two 3/3 creatures with mentor attack and both mentor triggers target the same 2/2 creature, the first to resolve puts a +1/+1 counter on it and the second does nothing.
2023-11-10
If the creature with mentor leaves the battlefield with mentor on the stack, use its power as that creature last existed on the battlefield to determine whether the target creature has less power.

Tributary Instructor keyword rules

Mentor Rule 702.134

Mentor is a triggered ability. “Mentor” means “Whenever this creature attacks, put a +1/+1 counter on target attacking creature with power less than this creature’s power.”

If a creature has multiple instances of mentor, each triggers separately.

An ability that triggers whenever a creature mentors another creature triggers whenever a mentor ability whose source is the first creature and whose target is the second creature resolves.