Undergrowth — Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead.

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
: This creature gets +1/+1 until end of turn.

Counter target spell.
Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
When this enchantment enters, exile target nonland permanent an opponent controls until this enchantment leaves the battlefield.