Electrolyze

Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.

Mana Leak

Counter target spell unless its controller pays {3}.

{U}, {T}: Draw two cards.
{R}, {T}, Discard a card: Mercurial Chemister deals damage to target creature equal to the discarded card's mana value.

Draw a card, then draw cards equal to the number of cards named Accumulated Knowledge in all graveyards.

Flying
Whenever Thundering Djinn attacks, it deals damage to any target equal to the number of cards you've drawn this turn.

Target player draws two cards.
Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever Ophidian attacks and isn't blocked, you may draw a card. If you do, Ophidian assigns no combat damage this turn.

Swiftwater Cliffs enters tapped.
When Swiftwater Cliffs enters, you gain 1 life.
{T}: Add {U} or {R}.

Volcanic Hammer deals 3 damage to any target.

Counter target spell. Ionize deals 2 damage to that spell's controller.

Enchant creature
You control enchanted creature.