Vahlia, Valiant Summoner

+2: Summon 1 2/2 knight with vigilance.
-4: Give all creatures you control vigilance and +1/+0 until end of turn. If any creatures you control die this turn, draw a card.
-13: For each white creature you control, summon a 2/2 knight with vigilance. If this amount exceeds 4, they are 2/3's instead.