The best cards to proxy share a common trait: they are powerful enough to belong in almost any deck of their colour, expensive enough that buying originals is hard to justify for casual play, and impactful enough that having them genuinely improves your games
While your card choice is important in each of the game's formats, it is especially so in Commander, as you can only include cards in your deck that are within their commander's color identity
Theres the core spell, which takes up most of the card, and a subtype Adventure spell, located in the bottom left
I beat High Tide, Merfolk, Jund, Combo Elves, RUG Delver, Death and Taxes, Esper Stoneblade, U/W/R Delver, and Reanimator to finish Day 1 with a perfect record of 9-0