You may exile a red card from your hand rather than pay Cave-In's mana cost.
Cave-In deals 2 damage to each creature and each player.
Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +0/+2.
Bushido 2 (When this blocks or becomes blocked, it gets +2/+2 until end of turn.)
At the beginning of each end step, put a corpse counter on Scavenging Ghoul for each creature that died this turn.
Remove a corpse counter from Scavenging Ghoul: Regenerate Scavenging Ghoul.
: Exile target card from a graveyard. If it was a creature card, put a +1/+1 counter on Scavenging Ooze and you gain 1 life.
Scavenging Scarab can't block.