Eos, Almighty Lightning Lord

Flying

Once per turn, whenever you cast an instant or sorcery spell, you gain an experience counter.

Once per turn, whenever you cast an instant or sorcery spell with mana value equal to or less than the experience counters you have, copy it.

{1}{r/w}{w/u}{t}, Tap target creature, that creature isn't untapped on your next upkeep. Gain experience counters equal to its power.