Under ground monster fight

This is a fight ring for players to play monsters and fight against one another. the ring will be modified for what the players have and there will be rewards for conquering objectives and defeating opponents. there will be a number of rounds to help players who die early still have fun.
The home terrain will be included for every monster. as well as an additional room with obstacles for every creature, and a large open main center room. as time goes on more and more rooms will flood with danger elements.
the rewards are cards. that a creature may use as an action ON THEIR TURN
2, 3 = heal 1/4 your max hp
4, 5= cycle rooms (rooms change places around the center room)
6, 7 = next turn all attacks +5 to hit
8, 9 = until next turn AC +5 and saving throws at an advantage
10, J = steal cards from a player within 30 ft
Q, K = reveal other players for 2 turns.
A = mark-room for drop