Super mardi

If a player would begin an extra turn, that player skips that turn instead. If Ugin's Nexus would be put into a graveyard from the battlefield, in...

{T}: Add {R} or {W}. {R}{W}: Boros Keyrune becomes a 1/1 red and white Soldier artifact creature with double strike until end of turn. (It deals bo...

Equipped creature gets +1/+0 for each of its colors. Equip {1}

{T}: Mill two cards. {2}, Exile Perpetual Timepiece: Shuffle any number of target cards from your graveyard into your library.

{T}: Add {U} or {B}. {U}{B}: Dimir Keyrune becomes a 2/2 blue and black Horror artifact creature until end of turn and can't be blocked this turn.

Defender (This creature can't attack.)

Whenever a nontoken creature you control dies, you gain 1 life. Then you may draw a card. If you do, discard a card. {2}, {T}, Sacrifice Gate to t...

{T}: Target player mills a card. (They put the top card of their library into their graveyard.) {5}, {T}, Sacrifice Codex Shredder: Return target c...

When Prophetic Prism enters the battlefield, draw a card. {1}, {T}: Add one mana of any color.

Morph {5} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

{B}: Prakhata Pillar-Bug gains lifelink until end of turn. (Damage dealt by this creature also causes you to gain that much life.)

Hangarback Walker enters the battlefield with X +1/+1 counters on it. When Hangarback Walker dies, create a 1/1 colorless Thopter artifact creature...

Red creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, you may discard a card. If you do, draw a card.

{T}: Add {B} or {G}. {B}{G}: Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch until end of turn.

Creatures your opponents control with hexproof can be the targets of spells and abilities you control as though they didn't have hexproof. {3}, Sa...

Equipped creature gets +1/+1 for each enchantment you control. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Whenever Renegade Freighter attacks, it gets +1/+1 and gains trample until end of turn. Crew 2 (Tap any number of creatures you control with total ...

{T}: Add {R} or {G}. {R}{G}: Gruul Keyrune becomes a 3/2 red and green Beast artifact creature with trample until end of turn.

{T}: Add {U} or {R}. {U}{R}: Until end of turn, Izzet Keyrune becomes a 2/1 blue and red Elemental artifact creature. Whenever Izzet Keyrune deals ...

Scrapheap Scrounger can't block. {1}{B}, Exile another creature card from your graveyard: Return Scrapheap Scrounger from your graveyard to the ba...

{4}, {T}: Draw a card.

Equipped creature gets +1/+1. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Whenever an ability of equipped creature is activated, if it isn't a mana ability, copy that ability. You may choose new targets for the copy. Equ...

As Pithing Needle enters the battlefield, choose a card name. Activated abilities of sources with the chosen name can't be activated unless they'r...