Given Mew's extensive history throughout the Pokemon TCG, there are plenty of valuable Mew cards in sets like Dragon Frontiers, Legend Maker, Holon Phantoms, and other top-tier expansions
If I was to play a major event though, I think the three/one split would be better, as some decks cannot beat the Angel in game one, but I would play the fourth Archon in the sideboard
While Ghalta can easily allow you to flood your board and set up for the win, it usually requires outside support from haste or trample to be truly effective
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We can discuss power creep all you want, but a nearly identical card getting printed more than 30 years later with a restriction set to it should give you an idea of how good of a card this is