If you send a monster that is LIGHT from his original attribute DARK to his GY with the effect of Subterror Succession, you can add his LIGHT monster from the Deck to your hand
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Notes and Rules Information for Fell the Mighty: Use the power of the target creature as Fell the Mighty resolves to determine which creatures are destroyed
"Your new Magic Online account includes everything you need to get started"
Cards like Unruly Catapult, Galvanic Juggernaut, Traxos, Scourge of Kroog, Staff of Compleation, Bender's Waterskin, and the game changer, Mana Vault all have ways to untap themselves
If you care about fixing for multiple colors and getting elementals into play, or want an extra creature lying around, you can probably play Llanowar Loamspeaker