Challenging a Character If an opponents Character is exerted (usually from questing), a player may Challenge it with one of their Characters
Buying in a rush at a premium price is the biggest loss
However, this card gets a lot better in a giant deck

Nekusar, the Mindrazer Nekusar, the Mindrazer | Illustration by Mark Riddick Commander (1) Planeswalker (4) Ashiok, Dream Render Jace Beleren Ob Nixilis Reignited Ob Nixilis, the Hate-Twisted Creature (19) Bone Miser Scrawling Crawler Razorkin Needlehead Elder Brain Fate Unraveler Fell Specter Goblin Electromancer Kami of the Crescent Moon Kess, Dissident Mage Magus of the Jar Nightscape Familiar Niv-Mizzet, Parun Niv-Mizzet, the Firemind Obosh, the Preypiercer Sheoldred, the Apocalypse Stormfist Crusader Tergrid, God of Fright The Locust God Vito, Thorn of the Dusk Rose Instant (11) Aetherize Bedevil Brainstorm Counterspell Crosis's Charm Dark Ritual Negate Perplex Rakdos Charm Terminate Vision Skeins Sorcery (11) Collective Defiance Cruel Ultimatum Dark Deal Deadly Tempest Diminishing Returns Game Plan Khorvath's Fury Peer into the Abyss Prosperity Wheel of Misfortune Whispering Madness Enchantment (8) Curse of Obsession Megrim Phyrexian Tyranny Raiders' Wake Spiteful Visions Underworld Dreams Well of Ideas Wizard Class Artifact (9) Arcane Signet Decanter of Endless Water Folio of Fancies Geth's Grimoire Mind Stone Relic of Sauron Otherworld Atlas Sol Ring Teferi's Puzzle Box Land (37) Seething Landscape Bojuka Bog Command Tower Crumbling Necropolis Thundering Falls Geier Reach Sanitarium Island x7 Maestros Theater Mountain x6 Myriad Landscape Smoldering Marsh Sunken Hollow Swamp x12 Xander's Lounge Undercity Sewers One of my first 3-color decks ever was Nekusar, the Mindrazer

This is, of course, all incredible, but with the knowledge of their bond, and the history that they have over the years, this card works on several fronts
Otherwise, put two +1/+1 counters on it