Bolas's Citadel (Draft Weekend) [War of the Spark Promos] SPA Inventora capaz Spend this mana only to

Spend this mana only to cast a Sliver spell

it deals damage to any target equal to the number of +1/+1 counters on Preyseizer Dragon

you may skip that turn instead

Set: Chronicles Type: Creature — Insect Common Cost: {1}{G} Flying {G}{G}: Emerald Dragonfly gains first strike until end of turn

Then you may pay {X}

Bolas's Citadel (Draft Weekend) [War of the Spark Promos] SPA Inventora capaz Spend this mana only toSet: War of the Spark Promos Type: Legendary Artifact Rare Cost: {3}{B}{B}{B} You may look at the top card of your library any time. You may play the top card of your library. If you cast a spell this way, pay life equal to its converted mana cost rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.