Judas Goats

Whenever another creature enters, you gain 1 life.

Sacrifice a creature: Add .

Creatures don't untap during their controllers' untap steps. Whenever a creature enters, untap all creatures.

All lands are 1/1 creatures that are still lands.

: Add . , : Create a 0/1 white Goat creature token. , Sacrifice X Goats: Add X mana of any one color. You gain X life.

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.