The Master of Keys

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters tapped. T: Add G. G, T: You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater.

Destroy target creature an opponent controls. That player loses 3 life. Exile Suspended Sentence with three time counters on it. Suspend 3—1B (Rather than cast this card from your hand, you may pay 1B and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

This land enters tapped. When this land enters, exile target player's graveyard. T: Add B.

Equipped creature has deathtouch and lifelink. (Any amount of damage it deals to a creature is enough to destroy it. Damage dealt by this creature also causes you to gain that much life.) Equip 2 (2: Attach to target creature you control. Equip only as a sorcery.)

This land enters tapped. As it enters, choose a color other than blue. T: Add U or one mana of the chosen color.

T: Add C. T: Add W or U. This land deals 1 damage to you.

When you set this scheme in motion, create a token that's a copy of your commander, except it's not legendary.

Whenever you cast an enchantment spell, create a 4/4 white Angel creature token with flying.