Huatli's Spurring
Oracle Text
Target creature gets +2/+0 until end of turn. If you control a Huatli planeswalker, that creature gets +4/+0 until end of turn instead.
Card Rulings
9/29/2017 Whether you control a Huatli planeswalker is checked only as Huatli’s Spurring resolves. The creature’s power won’t change later in the turn if Huatli leaves or comes under your control.
Red buffs like these make me wish they would reprint Brute Force...