IRL One of the best ways to play Cube is at home or at an LGS with your friends
The most expensive card in the Lost Origin set is Giratina V (Alt Art)
Trickster's Elk You want to say Trickster's Elk is like removal, and granted, switching off the busted activated abilities on a key creature is impactful in a singleton format, just make sure you don't care about your opponent controlling a non-flying 3/3 because you might accidentally improve an opposing creature with +1/+1 counters
Every player joining in gets the Participation Prize, and the winner gets the Winner Prize
While it is five mana, that five mana is more than worth it considering it tracks artifacts put into the yard this turn, not just by the spell
Catacomb Slug Giant Slug Gluttonous Slug Molder Slug Morkrut Necropod Rocket-Powered Turbo Slug Spitting Slug Thermopod Toxrill, the Corrosive