Shadow Gate
Picture (this is important, as it is a field spell): A large, ominous door, shrouded in darkness, the surrounding area is a color comparable to the background of the End in Minecraft)
Field spell
Effect: When this card is activated, you can discard 1 card from your hand to the graveyard to add 1 "Seal of the Arbitrator" card from your deck to your hand. Once per turn, the turn player can special summon 1 "Arbitrator" monster from their hand, its effect is negated. If you do not control an arbitrator monster, destroy this card.

Arbitrator of flame
level 5/FIRE/Spellcaster
Effect: This card cannot be normal summoned/Set. When a monster declares an attack, you can special summon this card from your hand. This card cannot be destroyed by battle. If this card attacks or is targeted for an attack, it gains 500 attack.
1000 ATK/1000 DEF

Unform Arbitrator
Level 5/DARK/Spellcaster
Effect: This card cannot be normal summoned/Set. When your opponent normal or special summons a monster, you can discard this card to special summon 1 "Unform Token" [Level 5/Dark/Spellcaster/ ? ATK/ ? DEF]
to your side of the field in face-up attack position. The attack and defense of "Unform Token" is the attack and defense of the opponents summoned monster. When the token summoned by this effect is destroyed, you can special summon this card from your graveyard.
0 ATK/ 0 DEF

Guardian Arbitrator
Level 5/Dark/Spellcaster
Effect: This card can be normal summoned without tributing. While this card is face-up on the field, you cannot normal summon/set monsters.
2500 ATK/2500 DEF

Putrid Arbitrator
Level 5/ Dark/ Spellcaster
Effect:This card cannot be normal summoned/Set. When a card on the field is destroyed, you can special summon this card from your hand. Once per turn, if a card on the field would be destroyed, you can target 1 other card on the same side of the field, it is destroyed instead.
2000 ATK/2000 DEF

Arbitrator of stone
Level 5/ Earth/ Spellcaster
Effect:This card cannot be normal summoned/Set. If a card is set on the field, you can special summon this card from your hand. This card gains 500 defense each time a card is set. If this card is destroyed, you can target 1 monster your opponent controls, flip it into face-down defense position.
1000 ATK/1000 DEF

Arbitrator of wind

Jay's notes on playing GM until Varionus returns:

1) Do not abuse position

2) Randomly have Bell cave Lyall's face in whenever Krein does something OP

3) Ignore rule 1 when it involves rule 2 or general fun

4) Rethink rules 2 and 3

5) After completing rule 4, promptly ignore rule 4