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That'd be great on its own, but Ancient Cellarspawn also causes an opponent to lose life equal to the difference between the mana you spent and the mana you should have spent without all the discounts

Its pretty easy to grade properly if you have guidelines you can follow

They all have effects that trigger on their special summon as well

So high, in fact, that one of its cards had to be banned from Vintage for its power level

If the opponent knows that you have it, they can side in answers or change the plan (for instance Murktide players can side out Murktides, DRCs and rely more on Ragavan, Ledger Shredders and planeswalkers)

If a ramp deck develops, Invasion of Zendikar will likely be good in it, and the possibility of blinking it or of bouncing it to replay it offers a ton of mana