[DPR] Potential Energy turned Kinetic, a wanning wall turned massive board swing for Rank 4s

[Eshai]

Potential Energy

LIGHT | Rank 4 | Fiend/Xyz/Effect | 0 ATK/0 DEF

2 Level 4 monsters
Cannot be destroyed by battle or card effects. Once per turn, during the End Phase, if this card battled this turn: Immediately after this effect resolves, Special Summon 1 Rank 5, 6, 7, or 8 Xyz Monster using this card as material. (This is treated as an Xyz Summon. Transfer this card's materials to the Summoned monster.)

Card Link: https://www.duelingbook.com/card?id=2759457

Art Link: https://www.pixiv.net/en/artworks/93649719

 

 

DPR needed something for Rank 4s that's a bit more solid of a wall, but I figured just making a wall would be lame, so it comes with a mandatory rank up effect if it battles that turn. Works similar to Gladiator Beasts but I wanted to make it End Phase so it prevents too much abuse. You can either run it into something and take the damage or leave it up as a way to protect yourself sorta.

My thoughts on this is that its pretty balanced, though I feel maybe giving it access to other Rank 4s as well might prevent abuse as well as give a cool way of giving an additional material to a Rank 4. What do you guys think?