while the card had seen appreciation in value, I think it was a clear case of a small subset of buyers creating irrational marketplace conditions that led to some serious FOMO on collectors who were sitting on a bit of a lull in terms of what was happening in the marketplace at the turn of the year
Creature - Human Wizard Color tag templates(None) Karrthus, Tyrant of Jund Flying, haste When Karrthus enters, gain control of all Dragons, then untap all Dragons
And yes I very recently was running Reality Smasher, but I had to cut it because we weren't able to cycle through our deck at all fast enough
If you want a better idea of how magic cards are made, check out this article
When everything resolves, both Tidewater Minion and the mana source will untap, and you'll be free to tap the source to produce your mana and do it all again with TIdewater Minion