AA Battery

{T}, Sacrifice this token: It deals 3 damage to target creature.

Ada Taylor

{2}{UR}: Tap target noncreature artifact. It deals damage equal to its mana cost to another target. If it was equipped to a creature, you may pay its equip cost to unequip it.

Liam Hendricks

{4}{W}{U}: Create a token copy of target noncreature artifact.
{X}{X}, {T}: Create X tapped colorless artifact tokens named AA Battery with “{T}, Sacrifice this token: It deals 3 damage to target creature.”

Jin Takahashi

When Kasai enters, put X burn counters on each creatures target opponent controls. (A creature has -1/-1 and takes 1 damage at the beginning of combat for each burn counter on it. This damage cannot bring it below 1 toughness.)
{R}{R}, {T}: Return Kasai to your hand.

Raziel Walker

Double strike
{1}{R}: Byakko deals damage equal to its power to target enemy creature. Then, if that target is still on the battlefield, it deals damage equal to its power to Byakko.
{1}{U}, {T}: Byakko gains shroud until your next upkeep.

Raven Williams

Whenever Q enters, phases out, or phases in, deal 1 damage to target opponent.
{1}{U}{R}, {T}: Create a 1/1 blue red Spirit token named Q’s Shadow Clone with vanishing 3 and “{T}: Deal 1 damage to target opponent.”
{T}: Untap Q, then it phases out.

Abigail Lustgarten

{1}{W}{W}: Prevent all damage that would be dealt to and dealt by target creature this turn.

Damien Trudeau

Kicker {2}{R} (You may pay an additional {2}{R} as you cast this spell.)
First Strike, vigilance
When Ryu enters, if it was kicked, it deals 2 damage to all creatures your opponents control.
{U}{R}: Ryu deals 2 damage to target creature. If it survives, remove all damage from it, it loses all abilities, and becomes a 0/3 until end of turn.