In a game played under tournament rules, a card from outside the game comes from your sideboard
The value cards are also present, with a reprint to another one of my favorite cards, Shimmer DragonShimmer Dragon, which gives us something to do with excess artifact tokens
You'll keep any hand that actually generates your mana advantage quickly enough, but you may need to sequence your enablers to maximize your chance of actually doing something
Whenever an opponent casts a spell with mana value, power, or toughness equal to that number, they lose two life and the original player draws a card
Just like the previous card this is also strong in cycling and self-mill brews as well, and it's in the color of cycling matters engines like Archfiend of Ifnir