Clay, the Enthusiastic

Whenever Clay, the Enthusiastic or another creature
you control attacks, choose a colour. Creatures of the
chosen colour get +2 | +0 for each other attacking
creature that is not that colour.
{3}{r}{r}, {t} — there is an additional combat phase
after this phase.
Rewind squad - (rewind squad creatures are the colours
of your commander if your commander is a rewind
squad creature)