+Mongrel (5)
Discard a card: Hell Mongrel gets +1/+1 until end of turn.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, Hellfire Mongrel deals 2 damage to that player.
When Mongrel Pack dies during combat, create four 1/1 green Dog creature tokens.
As long as you control an artifact, Scrapyard Mongrel gets +2/+0 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)
Discard a card: Wild Mongrel gets +1/+1 and becomes the color of your choice until end of turn.
Gatherer works better in the Companion app!
(If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)