Sivvi's Ruse

If an opponent controls a Mountain and you control a Plains, you may cast this spell without paying its mana cost.
Prevent all damage that would be dealt this turn to creatures you control.

Sunken Field

Enchant land
Enchanted land has "{T}: Counter target spell unless its controller pays {1}."

Misstep

Creatures target player controls don't untap during that player's next untap step.

Port Inspector

Whenever Port Inspector becomes blocked, you may look at defending player's hand.

Excise

Exile target attacking creature unless its controller pays {X}.

Rishadan Brigand

Flying
When Rishadan Brigand enters, each opponent sacrifices a permanent of their choice unless they pay {3}.
Rishadan Brigand can block only creatures with flying.

Rethink

Counter target spell unless its controller pays {X}, where X is its mana value.

Presence of the Master

Whenever a player casts an enchantment spell, counter it.

Wall of Frost

Defender
Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.

Flint Golem

Whenever Flint Golem becomes blocked, defending player mills three cards.

Sage Owl

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

Tolarian Emissary

Kicker {1}{W} (You may pay an additional {1}{W} as you cast this spell.)
Flying
When Tolarian Emissary enters, if it was kicked, destroy target enchantment.

Confiscate

Enchant permanent
You control enchanted permanent.

Worry Beads

At the beginning of each player's upkeep, that player mills a card.

Levitation

Mana Vapors

Lands target player controls don't untap during their next untap step.

Djinn of Wishes

Flying
Djinn of Wishes enters with three wish counters on it.
{2}{U}{U}, Remove a wish counter from Djinn of Wishes: Reveal the top card of your library. You may play that card without paying its mana cost. If you don't, exile it.

Credit Voucher

{2}, {T}, Sacrifice Credit Voucher: Shuffle any number of cards from your hand into your library, then draw that many cards.