Overlord of the Mistmoors not behaving properly as an enchantment
A known bug, or at the very least, unclarified behavior on Gatherer https://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=673428 with enchantments with Impending counters.
1) Overlord of the Mistmoors has been cast for its 4 mana (2W2-) Impending 4 cost and enters the battlefield as a 4 mana enchantment with 4 Impending counters.
2) Karn's Sylex is already on the battlefield and untapped.
3) Opponent activates Karn's Sylex for X=4.
4) Overlord of the Mistmoors is not exiled and remains on the battlefield as if it were already a 7 mana enchantment.
Please clarify the mana value of Impending enchantments and/or correct their displayed on-field mana value to reflect the actual mana value as calculated by the engine.
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DAC169#34537 commented
I would assume that it's no different than another permanent cast with kicker, madness, or anything else that changes the cost to cast it; the mana value would still be the value listed in the top-right corner. The only exceptions I know of to that being the mana value would be face-down cards, the backside of transforming DFCs, artifact creatures cast for their prototype cost, and now rooms with both halves unlocked.
It makes me confused as to why it would show up as having a mana value of 4.