Sludge Strider [Planechase] 278 You can only this effect

You can only this effect of "Gravekeeper's Supernaturalist" once per turn

Set: Dark Crisis Card type: Equip Spell Rarity: Common Attack: 0 Defense: 0 You must send 1 card from your hand to your Graveyard when you activate this card

when your opponent activates a card or effect that targets a card(s) you control

Set: Mirage Type: Artifact Rarity: Rare Cost: {4} {4}

Sludge Strider [Planechase] 278 You can only this effectSet: Planechase Type: Artifact Creature Insect Rarity: Uncommon Cost: {1}{W}{U}{B} Whenever another artifact enters the battlefield under your control or another artifact you control leaves the battlefield, you may pay {1}. If you do, target player loses 1 life and you gain 1 life. Underneath the cities of Esper are cycles of life unseen by those who feed them.