During each player's End Phase: You can destroy 1 monster on the field. While this card remains face-up on the field, both players can only Summon once per turn unless they control an 'SCP' monster.
There will be more to come, and I can go back and make some edits. Just make sure you don't brick because you will have a high tendency of doing so, but if you can get one boss out, you win. There exist smaller Level 4 members that don't lock off summons, but are low power and really only exist to make summoning the Level 6/8/10 bosses faster (a la Edea/Eidos). They have access to Monarch support cards, but not enough speed to really abuse them. OK, not really as bad, but something along the lines of 'you can only summon 1 monster per turn' (unless you're an SCP monster in which case you can make another one). Remember The Last Warrior from Another Planet? Yeah, basically high Level monsters that lock off the summoning of another monsters while they exist on the field. Welcome to a post-apocalyptic world where the human race is on the verge of extinction and only a select few exist.