Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

Lonely Sandbar

Lonely Sandbar enters the battlefield tapped.
{T}: Add {U}.
Cycling {U} ({U}, Discard this card: Draw a card.)

Force Spike

Counter target spell unless its controller pays {1}.

Island

Counterspell

Cloud Sprite

Flying (This creature can't be blocked except by creatures with flying or reach.)
Cloud Sprite can block only creatures with flying.

Zephyr Falcon

Shadow Rift

Target creature gains shadow until end of turn. (It can block or be blocked by only creatures with shadow.)
Draw a card.

Boomerang

Return target permanent to its owner's hand.

Sandbar Merfolk

Cycling {2} ({2}, Discard this card: Draw a card.)

Indentured Djinn

Flying
When Indentured Djinn enters the battlefield, each other player may draw up to three cards.

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Saprazzan Heir

Whenever Saprazzan Heir becomes blocked, you may draw three cards.