Mr. Beast

{1}{u} Team Seas: All creatures of water type you control get a 1/1 token until Mr. Beast is out of play.
{1}{g} Team Trees: All creatures of tree type you control get a 1/1 token until Mr. Beast is out of play.
{2} Challenge: Opponent rolls D20, if below 15, exile one creature, if above, opponent gains 5 HP.
{3}{u}{g} Giveaway: All creatures on battlefield get 1/1 token until next untap.
{t}{4}{u}{g} $1M Donation: All creatures you control get 3/3 Haste and Menace for 2 untap cycles.