BOO Draft #1

Beast Mode can't be countered.
Target creature gets +10/+10 and trample until end of turn. At the beginning of the next end step, sacrifice this creature.

Enchant creature
Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card and put it onto the battlefield, and put a land card from your hand onto the battlefield. Then shuffle your library.

As an additional cost to play Manamorphosis, place a depletion counter on X Forests you control. As long as a land has a depletion counter on it, it can only tap for colorless mana.
Put X 2/4 green Treefolk creature tokens onto the battlefield.