hideaway cards mtg How does work in Magic: The Gathering? Rules Text: Hideaway, Type: Land,

Other creatures reap the benefits of spellcasting without actually needing to be the target of said spells

Madness makes Emrakul go to exile rather than the graveyard, the madness trigger goes onto the stack, and when it resolves, you have the opportunity to pay the alternative cost right away if you want to cast it, else our Eldrazi friend will be moved from exile to the graveyard (as if it had been discarded normally)

He seems to have the making of some kind of red voltron commander deck where you just lay a ton of stuff on him so he can finish off opponents all at once

5 Cards to run with Miles "Tails" Prower Prodigys Prototype: Making trained pilots, Prodigys Prototype also benefits from Tails granting flying to it, as well as a low crew cost