what does x mean on mtg cards the value Magic: The Gathering's Decree of Justice card? What does double x in

Theres a lot of established heuristics on this subject, and a few points I can toss in to help you construct an optimal mana base for Standard, Modern, Pioneer, or whatever MTG format you prefer

Turn 3 Karn might be good, but Wurmcoil Engine is almost always an embarrassment

There isnt a way to profitably interact with a blitz mechanic coming your way aside from exiling, so its almost like cycling a card and doing some damage

Recent to mid-era sets

Let's get into it

Some of those cards are used in the infamous Simic Flash deck, which dominated Standard and maintains a powerful position in the current Historic meta