Ekul, Galvanic Instigator

Eminence —Whenever an opponent casts their
first spell each turn, target creature they control
gets +1/+0 until your next turn and is goaded.
Vigilance, haste, rampage 1, forestwalk, prowess
{u}{r}{g}, {t}: Each player reveals the top card of
their library, then casts it at no cost unless they
pay {x}, where X is Ekul's power. Exchange
control of up to two of those spells. Their new
controllers may assign them new targets.