Agonizing Syphon

Agonizing Syphon deals 3 damage to any target and you gain 3 life.

Rumor Gatherer

Alliance — Whenever another creature enters the battlefield under your control, scry 1. If this is the second time this ability has resolved this turn, draw a card instead.

Gryff Rider

Flying
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)

Vanquish the Foul

Destroy target creature with power 4 or greater. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Elas il-Kor, Sadistic Pilgrim

Deathtouch
Whenever another creature enters the battlefield under your control, you gain 1 life.
Whenever another creature you control dies, each opponent loses 1 life.

Celestial Regulator

Flying
When Celestial Regulator enters the battlefield, choose target creature you don't control and tap it. If you control a creature with a counter on it, the chosen creature doesn't untap during its controller's next untap step.

Shattered Seraph

Flying
When Shattered Seraph enters the battlefield, you gain 3 life.
{2}, Exile Shattered Seraph from your hand: Target land gains "{T}: Add {W}, {U}, or {B}" until Shattered Seraph is cast from exile. You may cast Shattered Seraph for as long as it remains exiled.

Trusted Pegasus

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever Trusted Pegasus attacks, target attacking creature without flying gains flying until end of turn.

Leather Armor

Equipped creature gets +0/+1 and has ward {1}. (Whenever equipped creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {1}.)
Equip {0}. Activate only once each turn.

Plains

Swamp

Winged Words

This spell costs {1} less to cast if you control a creature with flying.
Draw two cards.

Tithebearer Giant

When Tithebearer Giant enters the battlefield, you draw a card and you lose 1 life.

Crystalline Nautilus

Bestow {3}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
When Crystalline Nautilus becomes the target of a spell or ability, sacrifice it.
Enchanted creature gets +4/+4 and has "When this creature becomes the target of a spell or ability, sacrifice it."

Wall of Denial

Defender, flying
Shroud (This creature can't be the target of spells or abilities.)

Demonmail Hauberk

Equipped creature gets +4/+2.
Equip—Sacrifice a creature.

Holy Strength

Enchant creature
Enchanted creature gets +1/+2.

Island

Rookie Mistake

Until end of turn, target creature gets +0/+2 and another target creature gets -2/-0.

Deal Gone Bad

Target creature gets -3/-3 until end of turn. Target player mills three cards. (They put the top three cards of their library into their graveyard.)