Force Spike

Counter target spell unless its controller pays {1}.

Kraken Hatchling

Kiora, the Tide's Fury

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Dark Ritual

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Boneyard Aberration

Reassembling Skeleton

{1}{B}: Return this card from your graveyard to the battlefield tapped.

Assault Strobe

Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Lightning Bolt

Toralf's Disciple

Thayan Evokers

Indris, the Hydrostatic Surge

Lightning Bolt deals 3 damage to any target.

Shivan Dragon

Sarkhan, Wanderer to Shiv

Flying
{R}: This creature gets +1/+0 until end of turn.

Prevent all combat damage that would be dealt this turn.

Giant Growth

Target creature gets +3/+3 until end of turn.

Freyalise, Skyshroud Partisan

Regal Force

When this creature enters, draw a card for each green creature you control.

Shoreline Scout

Tropical Island

First Sliver's Chosen

Sliver creatures you control have exalted. (Whenever a creature you control attacks alone, it gets +1/+1 until end of turn for each instance of exalted among permanents you control.)

Gilded Light

You gain shroud until end of turn. (You can't be the target of spells or abilities.)
Cycling {2} ({2}, Discard this card: Draw a card.)

Glorious Enforcer

Flying, lifelink
At the beginning of each combat, if you have more life than an opponent, this creature gains double strike until end of turn.

Jumpstart: Historic Horizons