This stage is known as the "gamma stage", and this is the place were Magic started to grow legs
Black decks like to make burst-mana and to keep their hands topped up
Splinter, Aging Champion If Splinter, Aging Champion were a different color it would not make this list, but white is excellent for flicker which means this approaches Thragtusk-level in use and is a great reason to make an EDH politic deal
In addition, it's also a new Eldrazi, something that hasn't been seen in a Standard set since 2016's Eldritch Moon

Advanced Search Sets Random Syntax Abandon Reason Alchemist's Greeting Alms of the Vein Anje Falkenrath Anje's Ravager Archfiend of Spite Arrogant Wurm Asylum Visitor Avacyn's Judgment Basking Rootwalla Big Game Hunter Biting Rain Blast from the Past Blazing Rootwalla Bloodboil Sorcerer Bloodhall Priest Bloodmad Vampire Brain Gorgers Brink of Madness Broken Concentration Call to the Netherworld Chilling Grasp Circular Logic Curse of Fool's Wisdom Dark Withering Descent into Madness Distemper of the Blood Emrakul, the World Anew Falkenrath Gorger Fiery Temper Frantic Purification From Under the Floorboards Gibbering Descent Gisa's Bidding Gorgon Recluse Grave Scrabbler Hell Mongrel Ichor Slick Incorrigible Youths Insatiable Gorgers Just the Wind Kitchen Imp Madlands (playtest) Malevolent Whispers Markov Baron Muck Drubb Murderous Compulsion Nagging Thoughts Necrogoyf Nightshade Assassin Obsessive Search Psychotic Episode Psychotic Haze Reckless Wurm Revolutionist Senseless Rage Shadowgrange Archfiend Skophos Reaver Stensia Masquerade Strength of Isolation Strength of Lunacy Stromkirk Occultist Terminal Agony Twins of Maurer Estate Violent Eruption Voldaren Pariah Weirded Vampire Welcome to the Fold

Your Temple Is Under Attack is a board protection spell, sure, but should also be used politically to sweeten a bargain