Yes, casting a spell with cascade triggers the cascade ability, allowing you to exile cards from the top of your library until you reveal a nonland card with a lower converted mana cost, which you can then cast for free.
No, "cascade" is not a triggered ability. It is a keyword ability that allows a player to cast a spell for free from the top of their library when they cast a spell with cascade.
When you use the buyback mechanic with Mizzix's ability in the game, you can pay an additional cost to return the spell to your hand after casting it. This can help you reduce the overall cost of the spell and trigger Mizzix's ability to reduce the cost of future spells.
No, copying a spell is not considered casting it.
No, copying a spell does not count as casting it.
You cannot. The ability to cast spells is a fantasy.
Transfiguration is spell casting.
Yes, replicating a spell counts as casting it.
No, cycling does not count as casting a spell in the game.
No, mutating a creature does not count as casting a creature spell.
No, copying a spell is not considered casting it in Magic: The Gathering.
Mana empties from your pool immediately after you finish casting a spell.
No, copying a spell in Magic: The Gathering does not count as casting it.