Double Masters

Artifact Creature — Illusion

Flying
Whenever another artifact you control enters, this creature gets +2/+2 until end of turn.

Glaze Fiend

Planechase

Creature — Elemental

First strike
Whenever another creature dies, you may put a +1/+1 counter on this creature.

Rockslide Elemental

Shards of Alara

Enchantment

Whenever a creature dies, you may have this enchantment deal damage to target player equal to the number of cards in that player's hand.

Vicious Shadows

Eventide

When this enchantment enters, search your library for any number of Plains cards, exile them, then shuffle.
At the beginning of your upkeep, you may put a card you own exiled with this enchantment into your hand.

Endless Horizons

Creature — Spirit

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Lingering Tormentor

Sorcery

Target opponent reveals their hand. You choose a green or white creature card from it. You gain life equal to that creature card's toughness, then that player discards that card.

Talara's Bane

Artifact Creature — Scarecrow

{3}: Target green creature gets +1/+1 until end of turn.