Venti, Seeking the Melody

Reach

Creatures you control can't attack alone.

Whenever you attacks, if you control three or more humans with different powers, choose one—
•Gain 3 life.
•Put a +1/+1 on target human you control.
•Tap four humans you control, create Dvalin a legendary 7/7 white Dragon with flying and "Whenever Dvalin deals combat damage to a player draw two cards."