mtg cards like howling mine Price & Card Details — Foreign Black Border if Howling Mine is untapped The deck trial looks similar

Cumulative upkeep says, "Hey, pay 3." Echo says, "I'm still good." And fading says, "Take off my last fading counter." Turn #8 During your untap step before you untap, Old Fogey phases out

Cards that don't function within MTG's rules, but "are intuitive, and otherwise non-problematic"

[-2]: Put a +1/+1 counter on each creature you control

The value of X won't change even if the number of lands you control changes after that point

Omnath, Locus of All can draw ultimatums faster and give you extra mana, and General Ferrous Rokiric gives you a big golem

Sure you won't always hit cards of mana value 6 or better, but it's a pretty good mana sink