ThLunarian
Member
It feel it's not really niche. It is an on-curve creature that works well with cheap spells and burn spells. It's not something you build around, unless you need some sort of justification for running Lightning Bolt. The activated ability is for the late game, where useful cards are a more valuable resource for many decks than mana. At its very worst, it's a 2/2 lifelinking Grizzly Bear, so there's little risk involved in including it if you have space.
You keep mentioning Sidisi. Sidisi is a three color legendary Hill Giant from a pure stat perspective, and isn't particularly impressive without support. She is not easy to splash and you can't just slap her in a list with generic good cards. She's a good card, but she's hardly safe. Grand Master in contrast is very safe and flexible, and it is that quality that I feel people underestimate. It provides survivability against faster decks, a long-game for low-curve decks, and a decent body with no real investment.
It's a good card. It's not the second coming and doesn't deserve anywhere near a $15 price tag. In most decks it's just a 2/2 life link dork. It may as well be a red/white gold card.
It'll settle at no more than $5 once the hype dies out, IMO.