Plague Engineer

Delve (Each card you exile from your graveyard while casting this spell pays for 1.) Magmatic Sinkhole deals 5 damage to target creature or planeswalker.

Other Cats you control get +2/+1.

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

Flash Flying When this creature enters, draw a card. This creature has deathtouch as long as you control at least three other snow permanents.

Equipped creature gets +2/+2 and has protection from black and from red. Whenever equipped creature deals combat damage to a player, destroy up to one target planeswalker and up to one target artifact. Equip 2

As this enchantment enters, choose a creature type. Creatures you control of the chosen type get +1/+1. 1, Sacrifice a creature of the chosen type: Target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Flying When this creature enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4. Overload 4GG (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")