First we had Conspicuous Snoop, a powerful 2-drop that created a simple two card, turn three combo kill in Modern as well as just being an excellent value engine, but now, we get Muxus, Goblin Grandee
The choice of what the best cards in a format are is obviously always somewhat subjective, and it will come down to what a given player likes to play
1 Opulent Palace

The new cards are: Ulalek, Fused Atrocity Azlask, the Swelling Scourge Angelic Aberration Benthic Anomaly Bismuth Mindrender Chittering Dispatcher Eldrazi Confluence Eldritch Immunity Hideous Taskmaster Inversion Behemoth Mutated Cultist Selective Obliteration Spawnbed Protector Twins of Discord Ulamog's Dreadsire Cards printed in Modern Horizons 3 , and therefore having that set symbol and code, are: Snapping Voidcraw Glaring Fleshraker Wastescape Battlemage Titans' Vanguard Twisted Landscape Tranquil Landscape The double-sided tokens are: 2 10/10 Eldrazi creature // 2/2 Spirit creature 2 Copy // 4/4 Eldrazi Angel creature with flying and vigilance 1 1/1 Shapeshifter creature with changeling // Copy 5 1/1 Eldrazi Scion creature with "Sacrifice this creature: Add ." // 0/1 Eldrazi Spawn creature with "Sacrifice this creature: Add ." Tokens, emblems and markers[] The Modern Horizons 3 Commander Decks come with 35 different tokens, 2 emblems, and 1 Energy Reserve helper card

Keen Sense is a Curiosity effect for a single mana, and Stamina is a way to provide vigilance and the ability to dodge some removal