Rune Snag

Counter target spell unless its controller pays {2} plus an additional {2} for each card named Rune Snag in each graveyard.

Chart a Course

Draw two cards. Then discard a card unless you attacked this turn.

Ornithopter

Unsubstantiate

Return target spell or creature to its owner's hand.

Ensoul Artifact

Enchant artifact
Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types.

Predict

Choose a card name, then target player mills a card. If a card with the chosen name was milled this way, you draw two cards. Otherwise, you draw a card.

Darksteel Myr

Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Ornithopter of Paradise

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Mind Control

Enchant creature
You control enchanted creature.

Fold into Aether

Counter target spell. If that spell is countered this way, its controller may put a creature card from their hand onto the battlefield.

Illusory Angel

Cast this spell only if you've cast another spell this turn.
Flying

Cryptic Serpent

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.

Blue Dragon

Flying
Lightning Breath — When Blue Dragon enters, until your next turn, target creature an opponent controls gets -3/-0, up to one other target creature gets -2/-0, and up to one other target creature gets -1/-0.

Sigiled Starfish

{T}: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Azure Mage

Aether Adept

When Aether Adept enters, return target creature to its owner's hand.

Opportunity

Cancel

Frogify

Enchant creature
Enchanted creature loses all abilities and is a blue Frog creature with base power and toughness 1/1. (It loses all other card types and creature types.)

Supreme Will

Choose one —
• Counter target spell unless its controller pays {3}.
• Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.