Sludge Monster is an odd way to remove threats, but it does it incredibly well, and if you can then copy it as well, youll be laughing
A pattern of cards has popped up in red cards that let you take a creature from your hand and put it on the battlefield, getting around casting costs and counterspells, though they generally have the trade-off of having to sacrifice that creature at the end of the turn
Among wizards, poor timing is the most consistent mistake. Market price $1.96 Based on the latest market prices tracked on TCG Stacked
You can't bring your own fire extinguishers
Supporting both attacking and defending, when Mirri becomes tapped and attacking, your opponents can only block with one creature, putting them in a bind