Theros

Heliod's Emissary | Enchantment Creature | Elk | Bestow {6}{W} (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.) Whenever Heliod's Emissary or enchanted creature attacks, tap target creature an opponent controls. Enchanted creature gets +3/+3. | Sam Burley

Thassa's Emissary | Enchantment Creature | Crab | Bestow {5}{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.) Whenever Thassa's Emissary or enchanted creature deals combat damage to a player, draw a card. Enchanted creature gets +3/+3. | Sam Burley

Cutthroat Maneuver | Instant | | Up to two target creatures each get +1/+1 and gain lifelink until end of turn. | Brad Rigney

Erebos's Emissary | Enchantment Creature | Snake | Bestow {5}{B} (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.) Discard a creature card: Erebos's Emissary gets +2/+2 until end of turn. If Erebos's Emissary is an Aura, enchanted creature gets +2/+2 until end of turn instead. Enchanted creature gets +3/+3. | Sam Burley

Insatiable Harpy | Creature | Harpy | Flying, lifelink | Matt Stewart

Fanatic of Mogis | Creature | Minotaur Shaman | When Fanatic of Mogis enters the battlefield, it deals damage to each opponent equal to your devotion to red. (Each {R} in the mana costs of permanents you control counts toward your devotion to red.) | Matt Stewart

Purphoros's Emissary | Enchantment Creature | Ox | Bestow {6}{R} (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.) Menace (This creature can't be blocked except by two or more creatures.) Enchanted creature gets +3/+3 and has menace. | Sam Burley

Artisan's Sorrow | Instant | | Destroy target artifact or enchantment. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.) | Jung Park

Karametra's Acolyte | Creature | Human Druid | {T}: Add an amount of {G} equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.) | Chase Stone

Nylea's Emissary | Enchantment Creature | Cat | Bestow {5}{G} (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.) Trample Enchanted creature gets +3/+3 and has trample. | Sam Burley

Horizon Chimera | Creature | Chimera | Flash Flying, trample Whenever you draw a card, you gain 1 life. | Sam Burley

Anvilwrought Raptor | Artifact Creature | Bird | Flying First strike (This creature deals combat damage before creatures without first strike.) | James Zapata