Mandate of Abaddon, is a four mana board wipe that lets your biggest creature stay alive
You could then pay one hybrid mana to make it a 2/2
Yahenni uses that power to survive long enough to help the renegades deal with the Consulate, but afterwards chooses to let themself die rather than live through the death of others

Each deck contains: 1 60-card starter deck including 2 foil cards 11 Tokens 1 Rulebook 1 Booster pack containing 12 randomized cards Decklist: Amethyst & Steel 2 Akela - Wolf Pack Elder 2 Arthur - Wart 1 Fa Zhou - War Hero 3 Giant Cobra - Ghostly Serpent 3 HeiHei - Rambling Rooster 2 Helga Sinclair - Tough as Nails 1 Iago - Giant Spectral Parrot 3 Jafar - Aspiring Ruler 1 Jafar - Newly Crowned 2 Kashekim - Ancient Ruler 2 King Hubert - Phillip's Father 1 Madam Mim - Cheating Spellcaster 3 Mufasa - Respected King 2 Pain - Impudent Imp 2 Panic - High-Strung Imp 3 Rajah - Ghostly Tiger 1 Raya - Guidance Seeker 3 Razoul - Menacing Guard 2 Royal Guard - Bovine Protector 2 Tanana - Tribal Elder 2 Te Ka - Lava Monster 2 The Carpenter - Dinner Companion 2 Treasure Guardian - Foreboding Sentry 2 Amethyst Coil 2 A Very Merry Unbirthday 2 Double Trouble 2 Magical Maneuvers 1 Restoring the Crown 2 Retrosphere 2 Training Dummy 2 Beagle Boys - Small-Time Crooks 3 Belle - Apprentice Inventor 1 Beast - Frustrated Designer 1 Belle - Mechanic Extraordinaire 2 Chaca - Impressive Daughter 3 Cogsworth - Climbing Clock 2 Cy-Bug - Invasive Enemy 2 Donald Duck - Focused Flatfoot 2 Edgar Balthazar - Ambitious Butler 2 Gaetan Moliere - The Mole 3 Jebidiah Farnsworth - Expedition Cook 1 Kida - Creative Thinker 1 Lyle Tiberius Rourke - Crystallized Mercenary 2 Marie - Favored Kitten 1 Maurice - Unconventional Inventor 2 Moana - Island Explorer 2 Monsieur D'Arque - Despicable Proprietor 2 Robin Hood - Eye for Detail 2 Sir Kay - Unruly Knight 3 Stabbington Brother - Without a Patch 3 Toby - Dogged Companion 1 All is Found 2 Ever as Before 2 Gold Coin 2 Helping Hand 2 Longboat 3 Maurice's Machine 2 Medal of Heroes 2 Ruby Coil 2 Unconventional Tool Booster pack rarity breakdown: 2 Rares, super rares, or legendaries 3 Uncommons 6 Commons 1 Foil card of any rarity Related Products

My line of thought back then was its better to have a card in hand I want to cast, than have a creature or land Im not currently using, and while weve seen similar effects printed since then, most of those will be two mana or more (outside of Village Rites)
Phyrexian mana on the ability, while being very flavorful, is also great mechanically, and its just really neat all round