On top of giving near immunity to counters, red and black have a ton of creature and artifact removal effects, and with Shadow giving them split second, you can get around most tricks that other colors can use to protect their permanents
Although the two cards sound similar, their effects and uses are wildly different
For Fun These precons did exceptionally well in this category, but Im going with Miracle Worker here

Advent of the Wurm Archfiend's Vessel Armada Wurm Awaken the Sky Tyrant Bloodsoaked Altar Bottle of Suleiman Broodmate Tyrant Call the Skybreaker Crested Sunmare Dark Wings Bring Your Downfall Death by Dragons Demonic Covenant Demonic Rising Din of the Fireherd Draconic Disciple Dragon Roost Dragonkin Berserker Dragonmaster Outcast Feudkiller's Verdict Garruk, Apex Predator Gideon, Ally of Zendikar Goro-Goro and Satoru Goro-Goro, Disciple of Ryusei Lathliss, Dragon Queen Look Skyward and Despair Loot Dispute Mammoth Bellow Nahiri, the Lithomancer Ob Nixilis of the Black Oath Old One Eye Omnath, Locus of Rage One Dozen Eyes Priest of the Blood Rite Quest for the Gravelord Rite of the Dragoncaller Rith, the Awakener Avatar Roar of Endless Song Sandwurm Convergence Sarkhan the Mad Shiv Skirsdag High Priest Skyline Despot Spawning Grounds Tatsumasa, the Dragon's Fang Temur Monument The Sentry, Golden Guardian Tidal Wave Tolsimir, Midnight's Light Tomb of Urami Tuktuk the Explorer Water Gun Balloon Game

Snacks provided and cosplay encouraged
Lazav, Wearer of Faces The head of the Dimir hasn't been seen in months