Force of Wardrobe

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.)
As long as white is in the clothing worn by you,
white creatures you control get +1/+1. The same
is true for blue, black, red, and green.
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"Be uniquely you. Stand out. Shine. Be colorful. The
world needs your prismatic soul!"
- Amy Leigh Mercree