Powder Keg [Urza's Destiny] Champions of Kamigawa Set: Aether Revolt Type: Artifact

Set: Aether Revolt Type: Artifact Creature — Construct Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1/+1 counters on it

double the number of +1/+1 counters on each creature you control

They each have flying and "This creature can't be enchanted

Set: Portal Three Kingdoms Type: Legendary Creature — Human Soldier Rare Cost: {3}{U}{U} Horsemanship (This creature can't be blocked except by creatures with horsemanship

you may return target nonland permanent card from your graveyard to your hand

Powder Keg [Urza's Destiny] Champions of Kamigawa Set: Aether Revolt Type: ArtifactSet: Urza's Destiny Type: Artifact Rare Cost: {2} At the beginning of your upkeep, you may put a fuse counter on Powder Keg. {T}, Sacrifice Powder Keg: Destroy each artifact and creature with converted mana cost equal to the number of fuse counters on Powder Keg.