Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
, Sacrifice an artifact or creature: You gain 1 life and draw a card.

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

You draw two cards and you lose 2 life.

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have ": Regenerate this permanent."

Other Goblins get +1/+1 and have mountainwalk.

Enchant land
Enchanted land has ", Pay 1 life: Draw a card."

Equipped creature gets +3/+1.
Whenever equipped creature dies, you may reveal cards from the top of your library until you reveal a creature card that shares a creature type with it. Put that card into your hand and the rest on the bottom of your library in a random order.
Equip

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.

Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn.

Search your library for a card, put that card into your hand, then shuffle.

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

As long as Gaea's Liege isn't attacking, its power and toughness are each equal to the number of Forests you control. As long as Gaea's Liege is attacking, its power and toughness are each equal to the number of Forests defending player controls.
: Target land becomes a Forest until this creature leaves the battlefield.