While there needed to be something to do with your cards once they rotated out of Standard on MTG Arena , not working toward one of the already established formats was confusing
Dokuchi Silencer
Casting Cost: Card Type: Legendary Creature - Dwarf Wizard Card Text: Whenever you cast a noncreature spell, Shantotto gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell
You can spend any excess mana looting and stocking away exiled cards, which you can then, well, convert into currency (Treasure), or 2/2 Rogues if you prefer
The Mystic Remora allows you to draw a card whenever your opponent casts a non-creature spell, which I guess is the 'feeding off the scraps' here
In a multiplayer match, this means sending them into your other opponents, or into your rattlesnake creatures with deathtouch for some convoluted removal