If the equipped creature is no longer on the battlefield at that time, use its power as it last existed on the battlefield
Like most Pokmon cards, the value of Magneton depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Base Set 2)
Indestructible Hexproof is amazing
For example, if one breaks out as a very popular card and we need to reprint an in-world version at some point. Transformers isnt the only popular IP that Magic: The Gathering has partnered with recently, most recently announcing a Warhammer 40K collection
This is likely due to the Mew VMAX Alternate Art being not quite Alternate enough
If you do, you get the city's blessing