Kaleb and Callie, Eternal Bond

Double strike, Indestructible
Harmony Draw: Whenever Kaleb and Callie attack, you may pay {3}{g/u}. If you do, draw cards equal to the number of attacking creatures you control, then untap target
land for each card drawn this way.
{x}{g}, {t}: Create {x} 1/1 Squirrel tokens,
where {x} is the number of mana spent.