Brimstone Trebuchet 
Artifact Creature — Wall
Defender, reach
: This creature deals 1 damage to each opponent.
Whenever a Knight you control enters, untap this creature.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL