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'Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
{1}{B}{G}, Sacrifice an artifact or creature: You gain 1 life and draw a card.
'Sacrifice a Human: Transform this creature. Activate only as a sorcery.
'This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.
'Vigilance
{6}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
'Discard a card: This creature gets +2/-2 until end of turn.
'At the beginning of your upkeep, this creature deals 1 damage to you.
Bring fear to the table with Ravenloft: The Horrors Within, the ultimate horror expansion. As Dungeon Master, you are the mastermind pulling the strings, wielding multiple genres of horror, shadowy Domains...
'Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
{1}{B}{G}, Sacrifice an artifact or creature: You gain 1 life and draw a card.
'Vigilance
{6}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
'If an opponent had three or more cards put into their graveyard from anywhere this turn, you may pay {0} rather than pay this spell's mana cost. Exile target player's...
'Sacrifice an artifact: This creature gets +2/+2 until end of turn.
'Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
{1}{B}{G}, Sacrifice an artifact or creature: You gain 1 life and draw a card.