msem-instigator

Tribute 4 (As this creature enters the battlefield, an opponent of your choice may put four +1/+1 counters on it.)
When Slaughter enters the battlefield, if tribute was paid, destroy all other creatures. Otherwise, destroy all creatures you don't control.

Choose target spell. Scry 3, then reveal the top card of your library. Counter the chosen spell unless its controller pays {X}, where X is that card's mana value. (To scry 3, look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Flying
When Sphinx of Riddles enters the battlefield, secretly choose a card name. You may reveal the chosen name any time.
Whenever a spell an opponent controls with the chosen name resolves, you may draw two cards.

Enchant creature
When Sprawled Arming enters the battlefield, put a +1/+1 counter on enchanted creature.
Enchanted creature has first strike.
{5}: Return Sprawled Arming to its owner's hand.

Equipped creature has “You may choose not to untap this creature during your untap step” and “{T}: Gain control of target creature with power 5 or greater for as long as you control this creature and it remains tapped.”
Equip {3}

Target player gains X life.

Return target creature to its owner's hand.
Draw a card.

Target creature gets -3/-3 until end of turn. If that creature would die this turn, exile it instead.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Regenerate target creature. (The next time this would be destroyed this turn, it isn't. Instead tap it.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.

Choose target opponent. Scry 3, then reveal the top card of your library. The chosen player discards an amount of cards equal to that card's mana value. (To scry 3, look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

When Through the Dust enters the battlefield, it becomes an Aura with enchant creature. Reveal the top seven cards of your library, put a creature card revealed this way onto the battlefield and attach Through the Dust to it. Then put the rest on the bottom of your library in any order. When Through the Dust is no longer on the battlefield, enchanted creature's controller sacrifices it.
Mirage {1}{U}{U}{U}

Flying
Tribute 2 (As this creature enters the battlefield, an opponent of your choice may put two +1/+1 counters on it.)
When Tireless Vulture enters the battlefield, if tribute wasn't paid, each opponent loses 3 life. You gain life equal to the life lost this way.

First strike (This creature deals combat damage before creatures without first strike.)

Choose one —
• Target player mills four cards.
• Draw a card.

Defender (This creature can't attack.)
Mirage {0} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Creatures you control get +1/+0 and attack each turn if able.
As long as you control four or more Mountains, attacking creatures you control get an additional +1/+0 and have first strike.

Prowess, haste
Mirage {R} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Flying
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

As an additional cost to cast this spell, sacrifice a land.
Create a 6/6 red Wurm creature token with “This creature can't be blocked by creatures with flying.”

{1}{R}, {T}, Sacrifice a land: Create a colorless Desert land token with “{T}: Add {C}.”
{1}{R}, {T}: Sacrifice a Desert: Destroy up to two target lands.