Walking Ballista [Double Masters] DP18 Set: Expedition: Base Set Type:

Set: Expedition: Base Set Type: Supporter Rarity: Uncommon

so this is one of several places where players can get a rare or mythic rare in a single Set Booster

Two-Headed Dragon can block an additional creature each combat

Set: Countdown Calendar Promos Type: Psychic Rarity: Promo Retreat cost: Colorless

In a rare display of ingenuity

Walking Ballista [Double Masters] DP18 Set: Expedition: Base Set Type:Set: Double Masters 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.