Reshiram & Charizard GX (20/214) [Sun & Moon: Unbroken Bonds] Portal Three Kingdoms it enters the battlefield as

it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card

"We had years to prepare

Set: Secret Lair Drop Series Type: Artifact Creature — Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1/+1 counters on it

Set: Arabian Nights Type: Artifact Rarity: Rare Cost: {10} {X}

Set: Sun & Moon: Team Up Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

Reshiram & Charizard GX (20/214) [Sun & Moon: Unbroken Bonds] Portal Three Kingdoms it enters the battlefield asSet: Sun & Moon: Unbroken Bonds Type: Fire Rarity: Ultra Rare Retreat cost: Colorless,Colorless,Colorless