The first of those is cost reduction, and the second is when a card allows you to take extra turns
It's a slow, annoying way to lose, which is why stall decks are frowned upon
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Well, if you hit a Wrenn's Resolve off Geological Appraiser, are you happy
In addition, it is very easy to trade knockouts favourably since my attackers are usually OHKOing my opponents Pokemon but very rarely get OHKOed in return (especially with Pot Helmet)
Supply is certainly going to be constrained (how many people came in second place during the Arena League that season?), and demand for such cards must be sparse in kind