Lore Seeker

Flying
Whenever Abyssal Specter deals damage to a player, that player discards a card.

Target creature gets +X/+X until end of turn, where X is the highest converted mana cost among permanents you control.

{U}, Sacrifice Aether Spellbomb: Return target creature to its owner's hand.
{1}, Sacrifice Aether Spellbomb: Draw a card.

Defender
Flying
When Ageless Sentinels blocks, it becomes a Bird Giant, and it loses defender.

Flying

Cleric creatures have vigilance.

Flying, first strike, vigilance, trample, haste, protection from black and from red

{8}, {T}: Aladdin's Ring deals 4 damage to any target.

Enchant creature
Enchanted creature gets +2/+2 for each other creature on the battlefield that shares a creature type with it.

At the beginning of your precombat main phase, add {B} for each charge counter on Altar of Shadows.
{7}, {T}: Destroy target creature. Then put a charge counter on Altar of Shadows.

Exile target artifact or enchantment.

You draw three cards and you lose 3 life.

Forests you control are 1/1 green Elf creatures that are still lands.
{1}{G}, Sacrifice an Elf: Target creature gets +3/+3 until end of turn.

{R}, {T}: Anaba Shaman deals 1 damage to any target.

{T}: Add {W}.

Ancient Ooze's power and toughness are each equal to the total converted mana cost of other creatures you control.

Flying
When Angel of Mercy enters the battlefield, you gain 3 life.

Flying
{T}: Target attacking or blocking creature gets +1/+1 until end of turn.

Counter target artifact or enchantment spell.

Morph {3}{B}
When Aphetto Exterminator is turned face up, target creature gets -3/-3 until end of turn.

Whenever a permanent is turned face up, you may draw a card.

{R}, Exile the top ten cards of your library: Arc-Slogger deals 2 damage to any target.

{T}: Draw a card.

Vigilance