Jam Breeding Machine (LON-026) - Labyrinth of Nightmare Unlimited

During each of your Standby Phases, Special Summon 1 Slime Token (face-up Attack Position/Aqua-Type/WATER/LEVEL 1/ATK 500/DEF 500) to your side of the field. As long as this card remains face-up on the field, you cannot Summon (including Flip Summon and Special Summon) any other monster.