Jade Guardian 
Creature — Merfolk Shaman
Hexproof (This creature can't be the target of spells or abilities your opponents control.) When this creature enters, put a +1/+1 counter on target Merfolk you control.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL