Walking Ballista [Aether Revolt Prerelease Promos]

Walking Ballista [Aether Revolt Prerelease Promos]Set: Aether Revolt Prerelease Promos Type: Artifact Creature Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1 +1 counters on it. {4}: Put a +1 +1 counter on Walking Ballista. Remove a +1 +1 counter from Walking Ballista: It deals 1 damage to any target.

Rhonas the Indomitable can't attack or block unless you control another creature with power 4 or greater

When you discard a card with 6 or more [Power] during your action phase

Set: EX: Ruby & Sapphire Type: Metal Rarity: Holo Rare Retreat cost: Colorless

Set: EX: Crystal Guardians Type: Psychic Rarity: Rare Retreat cost: Colorless

destroy Herald of Rebirth and close the combat chain

Set: World Championships 2009 Type: Colorless Rarity: Rare Retreat cost: Colorless

or [Defense]

Set: Asia Pacific Land Program Type: Basic Land — Forest Rarity: Common ({T}: Add {G}

Set: Fossil 1st Edition Type: Colorless Rarity: Holo Rare Retreat cost: Colorless

Set: XY: BREAKpoint Type: Water Rarity: Holo Rare Retreat cost: Colorless

{T}: Add {B} for each basic Swamp you control

"I'd call that a successful first test