Blood Bairn

Sacrifice another creature: This creature gets +2/+2 until end of turn.

Swamp

Lightning Bolt deals 3 damage to any target.

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

Create two 1/1 red Goblin creature tokens.

Sacrifice a creature: Put a +1/+1 counter on this creature.

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {B} or {R}.

This creature attacks each combat if able.
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.

Whenever this creature attacks, each opponent loses 1 life.

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Sacrifice a creature: This creature gets +2/+2 until end of turn.

{B}, {T}, Discard a card: Return target creature card from your graveyard to your hand.