Robin, Lord of Fluff

Guinea Pigs you control get +1/+1

When Robin enters the battlefield, create Frost, a legendary 1/1 Guinea Pig with "whenever Frost
attacks, tap up to one target creature and put a stun counter on that creature" and Speedy, a legendary
1/1 Guinea Pig with Haste and "when Speedy dies,
it deals damage equal to its power to any target."