+Oust (6)
Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
: Regenerate Grim Roustabout.
Choose target creature you control and target creature you don't control. The creature you control gets +2/+1 until end of turn if it's a Knight. Then those creatures fight each other. (Each deals damage equal to its power to the other.)
: Jousting Dummy gets +1/+0 until end of turn.
Equipped creature gets +2/+0.
During your turn, equipped creature has first strike.
Equip (: Attach to target creature you control. Equip only as a sorcery.)
Put target creature into its owner's library second from the top. Its controller gains 3 life.
Whenever Rakdos Roustabout becomes blocked, it deals 1 damage to the player or planeswalker it's attacking.
Gatherer works better in the Companion app!