Look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard.Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)When Shriekmaw enters, destroy target nonartifact, nonblack creature.Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)
Whenever equipped creature attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped.Equip (: Attach to target creature you control. Equip only as a sorcery.)
You may choose not to untap Immovable Rod during your untap step.Whenever Immovable Rod becomes untapped, venture into the dungeon., : For as long as Immovable Rod remains tapped, another target permanent loses all abilities and can't attack or block.
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)When Acidic Slime enters, destroy target artifact, enchantment, or land.
Flash (You may cast this spell any time you could cast an instant.)Enchant creatureEnchanted creature gets +1/+1.Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
Roll two d4 and choose one result. Create a number of 3/3 green Beast creature tokens equal to that result. Then search your library for a number of basic land cards equal to the other result, put them onto the battlefield tapped, then shuffle.
FlyingWhenever Fiend of the Shadows deals combat damage to a player, that player exiles a card from their hand. You may play that card for as long as it remains exiled.Sacrifice a Human: Regenerate Fiend of the Shadows.
, Sacrifice a creature: Exile the top card of your library. You may play that card this turn. (You still pay its costs. You can play a land this way only if you have an available land play remaining.)
Haste, : Exile target instant or sorcery card from your graveyard., , Sacrifice Izzet Chemister: Cast any number of cards exiled with Izzet Chemister without paying their mana costs.
Path of Ancestry enters tapped.: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)