Walking Ballista [Aether Revolt Prerelease Promos] BW65 Whenever you cast your second

Whenever you cast your second spell each t urn

destroy up to three target nonland permanents

shuffle Fblthp into its owner's library

you may pay 3 life

Put up to one of them on top of your library and the rest on the bottom of your library in a random order

Walking Ballista [Aether Revolt Prerelease Promos] BW65 Whenever you cast your secondSet: 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.