Varolz, the Scar-Striped 1BG

Legendary Creature ó Troll Warrior
Each creature card in your graveyard has scavenge. The scavenge cost is equal to its mana cost. (Exile a creature card from your graveyard and pay its mana cost: Put a number of +1/+1 counters equal to that cardís power on target creature. Scavenge only as a sorcery.)
Sacrifice another creature: Regenerate Varolz, the Scar-Striped.

While Varolz, the Scar-Striped is on the battlefield, the scavenge cost of a creature card in your graveyard is equal to its mana cost, including any colored mana requirements.

Abilities that reduce the cost to cast a creature spell or alternative costs you can pay rather than a cardís mana cost donít apply to activating a cardís scavenge ability.

The number of counters that a cardís scavenge ability puts on a creature is based on the cardís power as it last existed in the graveyard.

If the creature card you scavenge has x in its mana cost, X is 0.

If a creature card has multiple instances of scavenge, you can activate either ability (but not both, as the card will be exiled when you activate one of them). Varolzís ability doesnít affect the scavenge cost of a creatureís other scavenge ability.