Mila, Sovereign of Conquest

Haste, first strike, magnitude 3(If you pay {3} when casting this spell, it can't countered or targeted of a
spell or ability an opponent controls on the battlefield
unless that player pays {3} or the effect is countered.
Put three +1/+1 counters on it when it enters the battlefield.)
Each creature you control wth a +1/+1 counter
on it has flanking.