this is digging for mana...

, Sacrifice a creature: Return target creature card from your graveyard to your hand. : Put a +1/+1 counter on target creature.

This creature enters with two +1/+1 counters on it. , Remove a +1/+1 counter from this creature: Target player searches their library for a basic land card, puts it onto the battlefield tapped, then shuffles.

Landfall — Whenever a land you control enters, add one mana of any color.

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.