Search your library for a card with flashback and exile it, then shuffle. You may cast that card this turn. At the beginning of your next end step, if that card is in exile, put it into your graveyard.
Flashback {U}{R}

You may cast any number of target instant and/or sorcery cards from your graveyard with total mana value X or less without paying their mana costs. If a spell cast this way would be put into your graveyard this turn, exile it instead.

{1}{B}, Sacrifice another creature: Draw a card. Each player loses 1 life.

As an additional cost to cast this spell, sacrifice an artifact or creature.
Create three 1/1 red Elemental creature tokens.

Surface {2}{B}{G}{U}. Riverbed Snapper surfaces transformed.

Equipped creature gets +1/+1 and has flying.
Equipped creature dealing combat damage to a player causes abilities of that creature to trigger as though it entered.
Equip {1}{W}

Defender
Endgame
Rogue's Palace Bouncer can attack as though it didn't have defender as long as you're in your endgame.

Flash
If a player would search a library for one or more cards, they reveal those cards, and can't find nonbasic cards.

When Rose Court Claymore enters, you may attach it to target creature you control.
Equipped creature gets +2/+0.
Equip {2}

Tap up to two target creatures. Put a stun counter on one of them.

Target creature you control gets +2/+2 and gains indestructible until end of turn. If it was the target of another spell or ability this turn, create two 1/1 white Bird creature tokens with flying.

Trample
Ruin, the First Shard enters with a +1/+1 counter on it for each mana spent to cast it.

Trample
Whenever you cast a noncreature spell, put a +1/+1 counter on this Vehicle.
Crew 1

Choose one —
• Each opponent sacrifices a creature that's one or fewer colors.
• Each opponent sacrifices a creature that's two or more colors.

Return target artifact card from your graveyard to your hand.

Destroy target artifact or enchantment. If it was a token, you draw a card and gain 2 life.

Target attacking creature gets +3/+3 and gains trample until end of turn.

Flashback costs you pay cost {2} less.
{R}, {T}, Discard a card: Draw a card.

Untap all creatures you control. They gain reach until end of turn.

Choose one or both —
• Target creature gets +1/+1 until end of turn.
• Return target creature to its owner's hand.

Return target creature or land card from your graveyard to your hand. Shuffle up to three cards from your graveyard into your library.

Instant and sorcery spells with mana value 4 or greater you cast cost {1} less to cast.
{U}{R}, Sacrifice Samacris: Return target instant or sorcery card from your graveyard to your hand. The next spell you cast this turn with the same name as that card costs {2} less to cast.

Enchant creature
Enchanted creature has vigilance.
Whenever enchanted creature attacks or blocks, you gain 2 life.

Whenever Sanctis Banneret attacks, you may waste a nonwastes land you control. If you do, create a 1/1 white Nomad creature token with vigilance.

Flying
Whenever Sanctis Griffin deals combat damage to a player, permanents entering the battlefield under that player's control don't cause abilities to trigger until the beginning of your next turn.