To be clear, Tinybones, the Pickpocket is no Ragavan, but its got similarities
Not only to you benefit from the room abilities, but nearly every card either allows you to venture, synergizes with the venture mechanic, or both
Enduring Nazgl and Threat Nazgl
Mortuary Mire, Witch's Cottage, and Haunted Crossroads can be part of game-winning sacrifice engines, and putting such easy recursion on a land just asks for trouble
When that new game is over, you return to the original game with the loser of that game losing half of their life
Carth the Lion Carth the Lion is a super cool Planeswalker support card, doubling as both a repeatable Impulse effect plus a unique way to add loyalty counters to planeswalkers that we've never seen before