Theros

Fabled Hero | Creature | Human Soldier | Double strike Heroic — Whenever you cast a spell that targets Fabled Hero, put a +1/+1 counter on Fabled Hero. | Aaron Miller

Lagonna-Band Elder | Creature | Centaur Advisor | When Lagonna-Band Elder enters the battlefield, if you control an enchantment, you gain 3 life. | Min Yum

Observant Alseid | Enchantment Creature | Nymph | Bestow {4}{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.) Vigilance Enchanted creature gets +2/+2 and has vigilance. | Todd Lockwood

Scholar of Athreos | Creature | Human Cleric | {2}{B}: Each opponent loses 1 life. You gain life equal to the life lost this way. | Cynthia Sheppard

Wingsteed Rider | Creature | Human Knight | Flying Heroic — Whenever you cast a spell that targets Wingsteed Rider, put a +1/+1 counter on Wingsteed Rider. | Cynthia Sheppard

Daxos of Meletis | Legendary Creature | Human Soldier | Daxos of Meletis can't be blocked by creatures with power 3 or greater. Whenever Daxos of Meletis deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell. | Karla Ortiz

Anax and Cymede | Legendary Creature | Human Soldier | First strike, vigilance Heroic — Whenever you cast a spell that targets Anax and Cymede, creatures you control get +1/+1 and gain trample until end of turn. | Willian Murai

Chronicler of Heroes | Creature | Centaur Wizard | When Chronicler of Heroes enters the battlefield, draw a card if you control a creature with a +1/+1 counter on it. | John Stanko