I think Guiltfeeder usually kills quickly, as does Her Highness Phage the Untouchable
Since we've got this Prime Day deal on right now, the price drop softens the guilt of the impulse buy too, and perhaps makes it easier to justify
These topics are more generic, such as manabase, ramp, card draw, etc
Be careful with what you discard, as your opponent gets to conjure a copy of it and use any color of mana to play it
It won't allow its controller to lose the game for any reason, and the player's opponents cannot win, no matter what happens
Game shops will typically buy any card thats worth more than 50 cents or so, but theyre going to offer something called buylist prices. These are considerably cheaper prices than what they sell, so youre going to take a 10-20% hit on the value of your cards if you go this route