Assault Strobe

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

Target Minotaur

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Ancestral Recall

Extremely Slow Zombie

Last strike (This creature deals combat damage after creatures without last strike.)

Crumbling Necropolis

Crumbling Necropolis enters tapped.
{T}: Add {U}, {B}, or {R}.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.