Compulsive Research

Target player draws three cards. Then that player discards two cards unless they discard a land card.

Talrand, Sky Summoner

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Strategic Planning

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

Negate

Counterspell

Tezzeret's Gambit

({U/P} can be paid with either {U} or 2 life.)
Draw two cards, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Favorable Winds

Creatures you control with flying get +1/+1.

Whirlwind Denial

For each spell and ability your opponents control, counter it unless its controller pays {4}.

Sage of Epityr

When Sage of Epityr enters, look at the top four cards of your library, then put them back in any order.

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