Arcades Sabboth 
Legendary Creature — Elder Dragon
Flying
At the beginning of your upkeep, sacrifice Arcades Sabboth unless you pay .
Each untapped creature you control gets +0/+2 as long as it's not attacking.
: Arcades Sabboth gets +0/+1 until end of turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL