A creature that cannot be countered and gives your other creatures ward changes how opponents interact with your board
Card values are secondary-market estimates (PriceCharting / StockX / TCGplayer) that vary by condition and time

Adrestia Aetherwing, Golden-Scale Flagship Arcee, Acrobatic Coupe Balamb Garden, Airborne Bessie, the Doctor's Roadster Blitzwing, Adaptive Assailant Cyclonus, Cybertronian Fighter Damocles Base, Sword of Kang Esika's Chariot Flamewar, Streetwise Operative Goldbug, Scrappy Scout Golden Argosy Grond, the Gatebreaker Heart of Kiran Jackdaw Jetfire, Air Guardian Megatron, Destructive Force Optimus Prime, Autobot Leader Parhelion II Prowl, Pursuit Vehicle RMS Titanic Ratchet, Rescue Racer Shorikai, Genesis Engine Skysovereign, Consul Flagship Slicer, High-Speed Antagonist Starscream, Seeker Leader The Belligerent The Falcon, Airship Restored The Fantasticar The Fire Nation Drill The Indomitable The Last Ride The Lunar Whale The Omenkeel The Prima Vista The Prydwen, Steel Flagship The Regalia The Thanos-Copter Ultra Magnus, Armored Carrier Valor's Flagship Weatherlight Weatherlight Compleated

Once per turn, during either player's Damage Step, when this card battles an opponent's monster: You can discard 1 Spirit monster
This is especially important for decks like Miraidon ex and Raging Bolt ex because all of their attackers are basic Pokmon
Solemn Strike allows players to negate a special summon or monster effect for just 1500 Life Points, making it incredibly efficient in formats dominated by combo-heavy strategies