mtg timeshifted card list is:timeshifted · Scryfall Magic: The Gathering Search Time Spiral "Timeshifted" TSB |

With some self mill and an empty board, you can gain a good amount of value

Bugenhagen's second ability checks at the moment it would trigger to see if you control a creature with power 7 or greater

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Their trigger reads, Whenever a land enters the battlefield under your control, you may gain control of target creature for as long as you control Roil Elemental. So, basically, as long as you can keep Roil Elemental alive, you can absolutely steal every other Creature on the battlefield

Cards will naturally fall into your graveyard over the course of a game, but theres no reason not to hurry the process along a little with interactive cards like Swallowed by Leviathan