Cavern of Souls [Modern Masters 2017] Mirrodin Besieged if you didn't activate a

if you didn't activate a loyalty ability of a planeswalker this turn

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Set: Portal Three Kingdoms Type: Instant Uncommon Cost: {W} Cast this spell only during the declare attackers step and only if you've been attacked this step

If you lose the flip

then put a card from your hand on top of your library

Cavern of Souls [Modern Masters 2017] Mirrodin Besieged if you didn't activate aSet: Modern Masters 2017 Type: Land Mythic Cost: As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.