Indestructible
As long as your devotion to black and red is less than seven, Mogis isn't a creature.
At the beginning of each opponent's upkeep, Mogis deals 2 damage to that player unless they sacrifice a creature of their choice.

Return target card from your graveyard to your hand.

: Add .
, , Sacrifice a Desert: Exile all graveyards.

When Yggdrasil enters, exile all creature cards from your graveyard.
: Exile the top three cards of your library.
, : Put a creature card exiled with Yggdrasil onto the battlefield under your control. It gains haste until end of turn. Activate only as a sorcery.

Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeon. This ability triggers only once each turn. (To venture into the dungeon, enter the first room or advance to the next room.)
Create Undead — Whenever you complete a dungeon, return target creature card from your graveyard to the battlefield.

Changeling (This card is every creature type.)
Champion a creature (When this enters, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)

Flash
When this creature enters, copy target instant or sorcery spell. You may choose new targets for the copy.

+1: Target player draws two cards, then discards two cards.
−2: Gain control of target artifact.
−6: You get an emblem with "Whenever you cast a spell that targets one or more permanents, gain control of those permanents."

Whenever you cast a colorless spell, create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add ."
Whenever another colorless creature you control enters, this creature deals 1 damage to each opponent.

(: Add .)

Destroy target creature. If that creature dies this way, its controller creates two tokens that are copies of that creature, except their power is half that creature's power and their toughness is half that creature's toughness. Round up each time.

At the beginning of combat on your turn, put a +1/+1 counter on each of up to two target creatures you control.
, : Double the number of each kind of counter on up to two target creatures and/or artifacts you control.

Storm (When you cast this spell, copy it for each spell cast before it this turn.)
Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

, Reveal X white cards from your hand, Sacrifice this creature: You gain three times X life.

This artifact doesn't untap during your untap step.
: Add .
: Untap this artifact.

As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Each other creature you control of the chosen type enters with an additional +1/+1 counter on it.

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

This creature has first strike during your turn.
Whenever an opponent draws a card, this creature deals 1 damage to them.

This land enters tapped unless you control a Swamp.
: Add .
, : Draw a card, then you lose life equal to the number of cards in your hand.

When Clive enters, you may discard your hand, then draw cards equal to your devotion to red. (Each in the mana costs of permanents you control counts toward your devotion to red.)
, : Exile Clive, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery.