Jace's Sentinel 
Creature — Merfolk Warrior
As long as you control a Jace planeswalker, this creature gets +1/+0 and can't be blocked.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Merfolk Warrior
As long as you control a Jace planeswalker, this creature gets +1/+0 and can't be blocked.