mtg cards like living death Sell - Magic the Gathering CMD 2014] Scrap Mastery -

You pay 4 less, so you can see how advantageous that can be, but it gets better

This Contraption assembles a number of Contraptions equal to the difference between those results

The effect, which covers all lands, not just basics, was so powerful in the Commander format that it ended up being one of the few bans for that format

They stop being creatures at the end of your turn, allowing them to dodge sorcery speed removal

Energy counters don't go away as phases or steps end, or as the turn ends

Doing any or all of these at instant speed can allow you to set up game-ending turns out of seemingly nowhere, and its all tacked onto a counterspell