Cascade itself is something of an alternative cost, and the requirements for being able to cast that exiled spell rely on the regular mana cost of a card rather than any alternative, optional cost
the contents of your deck are decided only by the contents of the packs you get
Although these poems have never been written in their entirety, several Theros cards have little quotes from them
Fortunately, thePokmonTCG:Basic Energy Boxincludes a whopping 450 assortedbasic Energycards
If a spell or ability you control targets a creature an opponent controls with hexproof and Nowhere to Run leaves the battlefield while that spell or ability is on the stack, that creature becomes an illegal target for that spell or ability
I think of Vantress as like a second Extravagant Replication for artifacts and enchantments, allowing you to get more Court of Ambition triggers if you can make enough