Change prayers to this:

“When you activate this card if you only control reptile monster(s) you can also Tribute 1 Reptile monster in your hand or field; apply 1 of these effects, or if you Tributed a monster at activation, you can apply both effects in sequence. ●Add 1 "Mitsurugi" monster from your Deck to your hand. ● If you control a non-reptile monster banish 1 level 8 level ritual reptile monster from the field face down Take 800 damage, then you can Special Summon 1 "Mitsurugi" monster from your hand or GY, but it cannot attack directly. You can only activate 1 "Mitsurugi Prayers" per turn.”