Traditionally, there have been two primary schools of thought when it comes to building a sideboard in Modern: You can play narrow cards that are extremely powerful, or cards that are more broadly useful
Today well be talking about the newest Ajanis Pridemate wannabe, Gary the reprint, a dubious lord, and a green card that I nearly didnt include at all as my pick to see the most play, as well as a brief review of how well I did when I wrote a very similar article to this one for Throne of Eldraine
Force of Negation is a great combo stopper, but can't protect your own combo on your own turn, rendering it worse than most of the 1 CMC counterspells for purposes of actually winning
Bloodthirsty Conqueror On the surface, the Bloodthirsty Conqueror looks like any other big dumb five drop creature, with the extra synergy of being a vampire with a life gain ability (there are lots of both in MTG Foundations )
Put a +1/+1 counter on that creature
Note: Mystery Booster cards typically include a small printing of the Planeswalker symbol in the lower left corner, similar to what you see in cards from The List found in Set Boosters