Arena Trickster 
Creature — Human Shaman
Whenever you cast your first spell during each opponent's turn, put a +1/+1 counter on this creature.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Human Shaman
Whenever you cast your first spell during each opponent's turn, put a +1/+1 counter on this creature.