Kenriths reanimation ability works perfectly with your big cycling creatures, bringing them back at a discount
It's attacks are a bit costly on the energy front, but at least you can use Dangerous Nose to one-shot most Basic Pokmon, if you haven't reached four energy yet
Cards like Hangarback Walker and Walking Ballista are useless, Gemstone Mine is very bad, Aether Vial gets stuck, Counters Company loses half its combo, Pyromancer Ascension never goes activeall sorts of cards that see play become either useless or much worse
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One other strength of Iymrith is, in mulligan situations, keeping lands + Iymrith is a very real way to get back into the game
It was such a flavourful ability, and it seemed like a good idea at the time I'm sure