Garvin, Stage Performer

Whenever Garvin, Stage Performer or another
Bard enters the battlefield, create a treasure
token.
{x}{5}{r}{t} Place +X/+X counters on Bards you control. Until end of turn, all creatures gain
Rock 'N Roll
( Rock 'N Roll - At the start of combat, all creatures
must fight another creature, if able. Each player
takes turns choosing their attackers,
then blockers. )