mtg.wtf

Prowess
Whenever you cast a noncreature spell, you may pay {R/W}{R/W}. If you do, target creature gains double strike until end of turn.

At the beginning of your upkeep, you may have Shyft become the color or colors of your choice.

Flying
Whenever Siani, Eye of the Storm attacks, scry X, where X is the number of attacking creatures with flying.
Partner

Temporal Foresight — When Sibylline Soothsayer enters the battlefield, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or greater. Exile that card with three time counters on it. If it doesn't have suspend, it gains suspend. Put the rest of the revealed cards on the bottom of your library in a random order.

Whenever Sickle Dancer attacks, if your team controls another Warrior, Sickle Dancer gets +1/+1 until end of turn.

Wither

Eminence — Whenever you attack with one or more Knights, if Sidar Jabari of Zhalfir is in the command zone or on the battlefield, draw a card, then discard a card.
Flying, first strike
Whenever Sidar Jabari deals combat damage to a player, return target Knight creature card from your graveyard to the battlefield.

As long as you control a Desert or there is a Desert card in your graveyard, Sidewinder Naga gets +1/+0 and has trample.

Hexproof
As long as Siege Behemoth is attacking, for each creature you control, you may have that creature assign its combat damage as though it weren't blocked.

Trample
{3}{R}: Target creature can't block this turn.

Devoid
Whenever another nontoken creature you control dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}."

When Sigardian Evangel enters the battlefield, conjure a card named Sigardian Evangel into your hand. Discard that card at the beginning of the next end step.
When Sigardian Evangel enters the battlefield, tap target permanent you don't control.

As long as you've put one or more +1/+1 counters on a creature this turn, Sigardian Paladin has trample and lifelink.
{G}{W}: Target creature you control with a +1/+1 counter on it gains trample and lifelink until end of turn.

Bestow {4}{W}
Sightless Brawler can't attack alone.
Enchanted creature gets +3/+2 and can't attack alone.

Exalted

Whenever Sigiled Skink attacks, scry 1.

{3}{B}: Destroy target blocking creature at end of combat.

Ninjutsu {4}{U}{B}
Whenever Silent-Blade Oni deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost.

When Silhana Wayfinder enters the battlefield, look at the top four cards of your library. You may reveal a creature or land card from among them and put it on top of your library. Put the rest on the bottom of your library in a random order.

Flying
{G}, Sacrifice Silkwing Scout: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Creatures with power greater than Silumgar Assassin's power can't block it.
Megamorph {2}{B}
When Silumgar Assassin is turned face up, destroy target creature with power 3 or less an opponent controls.

Flash
Flying
Exploit
When Silumgar Sorcerer exploits a creature, counter target creature spell.

Conjure Elemental — {8}: Untap target land you control. It becomes an 8/8 Elemental creature with trample and haste until end of turn. It's still a land.

Partner with Trynn, Champion of Freedom
Menace
Sacrifice a Human: Put a +1/+1 counter on Silvar, Devourer of the Free. It gains indestructible until end of turn.

Flying
{U}: Change the target of target spell or ability that targets only Silver Wyvern. The new target must be a creature.