Xenocide:
Uses 13
. Uses all remaining
. Kills all ON FIELD creatures of a certain type you target (ex: If I targeted an Ash Eater, all the Ash Eaters out on the field would die, enemy or friendly). Continues to kill those creatures for 5 turns (they instantly die if they're drawn during this time).
Extinction (2 ideas):
Idea 1:
Uses 15
. Uses all remaining
. Kills ALL creatures of a certain type you target (ex: Target a Scarab, it will kill all the Scarabs on the field, and also remove all the Scarabs from ***both decks*** (edited that part).) To prevent decking out, maybe all the killed cards could be replaced with skeletons.
Notes: Seems a bit overpowered against fractal decks or spam decks such as Scarabs.
Idea 2:
Uses 15
. Uses all remaining
. Kills all on field creatures of a certain element you target(If I targeted an Ash Eater, all the fire creatures out on the field would die). Continues to kill those creatures for 5 turns.
Notes: Would wreck mono-decks and 5 turns without playing any creatures for a mono user might suck.