msem-instigator

Counter target noncreature spell unless its controller pays {2}.

Instant and sorcery spells your opponents cast cost {1} more to cast.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card.

Whenever you cast a noncreature spell, you may pay {U}. If you do or the spell was cast from your graveyard, draw a card.

Haste
Whenever Spellslinger Elf deals combat damage to a player, draw a card, then you may cast a card from your hand with mana value 3 or less without paying its mana cost.

Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Remove a +1/+1 counter from Spellsword Elite: The next noncreature spell you cast this turn costs {1} less to cast.

Flying, prowess
When Sphinx Mentor enters the battlefield or dies, draw a card.

Flying
When Sphinx of Ill Omens enters the battlefield, return target permanent to its owner's hand.
Discard a card: Target creature or player gains hexproof until end of turn.

Flying
{X}{U}: Gain control of target nonland permanent with mana value X until Sphinx of Supremacy leaves the battlefield. Activate only as a sorcery.

Spinerock Canyon enters the battlefield tapped unless you control a basic land.
{T}: Add {R} or {W}.

({T}: Add {R} or {W}.)
Spiraling Canyon enters the battlefield tapped unless you control a basic Mountain or a basic Plains.

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {W} or {U}.

{T}: Add {C}.
{T}: Add one mana of any color among creatures you control.
{X}: Spirit Blossom Shrine becomes an X/X Spirit creature until end of turn. It's still a land. Activate only if you control a creature with power X.

Lifelink
Revive {W} ({W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Draw two cards, then discard a card.
Whenever you cast an instant or sorcery spell, if Spirit Script is in your graveyard, you may have it become a copy of that spell until end of turn.

Whenever Spirit of Infamy attacks, post a bounty on target creature. (Put a bounty counter on that creature. It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)
Spirit of Infamy gets +2/+0 for each bounty counter on it.

Flying, lifelink
Skip your draw step.
Pay 3 life: Draw three cards. Activate only as a sorcery and only once each turn.

Once each turn, when you activate a nonmana ability, you may gain 1 life and draw a card.
{2}{W}{U}: You may tap or untap target creature or artifact.

Destroy target artifact or enchantment. Spit on the Grave deals 2 damage to that permanent's controller.

Splendid Scenery enters the battlefield tapped unless you control a basic land.
{T}: Add {G} or {W}.

Flying
Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)

Whenever a land enters the battlefield under your control, you may pay {1}. If you do, create a 1/1 green Saproling creature token.

{1}{G}: Exile two target cards from a single graveyard. When you do, germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

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.

Sacrifice any number of lands. Search your library for that many basic land cards, put them onto the battlefield, then shuffle.