Hero of Leina Tower

Creature - Human Warrior

Heroic — Whenever you cast a spell that targets Hero of Leina Tower, you may pay . If you do, put X +1/+1 counters on Hero of Leina Tower.

"You cannot achieve greatness if its seed has not already been planted in your heart."

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2013-09-15 Heroic abilities will resolve before the spell that caused them to trigger.
2013-09-15 Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
2013-09-15 Heroic abilities won't trigger when a copy of a spell is created on the stack or when a spell's targets are changed to include a creature with a heroic ability.
2018-12-07 The amount to pay for {X} is chosen as the triggered ability resolves. No player may take actions between the time you pay {X} and the time Hero of Leina Tower has X +1/+1 counters on it.

mtg.wtf