Instant speed is where you want to be with this type of effect since you can respond to someone casting Doom Blade on one of your creatures
By going wide and challenging as much as you can, the Hyenas will be building up two, four, six, or even more lore every turn if you're lucky
Legendary Creature Artifact - Robot Soundwave, Sonic Spy More Than Meets the Eye (You may cast this card converted for .) Whenever one or more creature tokens you control deal combat damage to a player, exile target instant or sorcery card with mana value equal to the damage dealt from their graveyard
It turns Lightning Bolt into a red Dark Ritual, for instance, while Blasphemous Act now doesn't just wipe the board, but also leaves you an inheritance of 13 treasures
64 lands and a handful of mana dumps later, I had a deck that either died quietly or detonated into splendid, jaw-achingly excessive victory (seriously, its always one or the other)
When the creature died, it created a 2/2 black Zombie with wither