"Million-Century Ice Prison" Rating Score by みめっと

It can be activated on the condition that a monster on your field leaves the field during each player's main phase due to the effect of the opponent's monster other than being destroyed, and has the effect of ending that main phase or skipping main phase 1 of the opponent's next turn. Quick-Play Spells.
In most cases, this effect will be activated during the opponent's turn, and when the opponent is about to remove their monsters with an effect with high resistance penetration, by ending Main Phase 1, you will be able to stop this further before the Battle Phase. You can prevent the field from being destroyed or deployed.
Also, if the opponent does this during your turn due to a monster's triggered instant effect, etc., you can skip the opponent's main phase 1 to prevent it from being deployed before the battle phase.
However, the activation conditions are completely dependent on the opponent, and since it is limited to monster effects and does not include destroying effects, its versatility is low. There is no change in the fact that it will be done.
Even if you use it normally, there are times when it's just a delayed card with troublesome activation conditions, and if the only difference between main 1 and 2 is to be deployed and you have to die that turn, it's OK to use 《Thunder of Ruler》or 《Threatening Roar》.》is enough, so if you use this card, you can combine it with other effects that allow you to skip the battle phase, or because it is a Quick-Play Spell, Nibiru is used when you go first, and you end up passing the turn with a half-baked board. I would like to pay attention to preventing instant death from counterattacks even when it is full.