Cost aside, the other big problems with cards like Omniscience is their lack of immediate impact and the fact that they taper off once you run out of cards in hand
The high popularity of this perpetually $10+ card compels me to remind everyone that you don't need to have $500 mana bases with shocks and fetches, and that budget mana bases are still very, very good
Long considered just a budget backup to Craterhoof BehemothCraterhoof Behemoth, its $25 price tag means that it no longer fulfills the budget role, and that's probably correct, given how good this thing is in its own right
Hullbreaker Horror From time to time, WotC likes to print overcosted finishers that aim to win the game on their own
The 5th Edition is not as much fun to play as earlier core sets, though most people will be creating decks with cards from other expansions too, which makes it more exciting
Your creatures are smaller, sneakier, and not ready to stand up in a knock-down brawl like tribes of Dragons, Angels, Beasts, Wurms, and more