Spore Frog

Sacrifice this creature: Prevent all combat damage that would be dealt this turn.

Swamp

Each player sacrifices a creature of their choice.

Whenever a player sacrifices a creature, you may put a +1/+1 counter on this creature.

This creature can't block.
Sacrifice a creature: Put a +1/+1 counter on this creature.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

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

Whenever you sacrifice another permanent, put a +1/+1 counter on this creature.

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

Sacrifice this creature: Target creature gets +3/+3 and gains trample until end of turn. Activate only during your upkeep.

Sacrifice this creature: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.