Overwhelm

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature’s color.)
Creatures you control get +3/+3 until end of turn.

Flavor Text: The Conclave acts with a single will, expressed by countless warriors.

Card Details:
Set: Magic 2015
Collector Number: 189
Artist: Wayne Reynolds