The madness cost will make it pair well with any kind of self-discard effect, to include the aforementioned Wheels
You'll often have the mana to target multiple players
Indestructibility Simple and straightforward, Indestructibility is an aura that makes one permanent well, indestructible
Being able to ramp when it attacks or enters the battlefield is a powerful effect, especially in formats with access to fetch lands
Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that damage without paying its mana cost
Standard card (Left) / Premium full art card (Right) Now, lets look at the original illustration premium full art cards that are included in Hidden Trials