I suspect the body is too off plan
Ive based my figures on this thread, which has numbers that more or less jibe with what Ive seen published elsewhere

Advanced Search Sets Random Syntax Abomination of Gudul Academy Raider Academy Wall Aclazotz, Deepest Betrayal Acquisition Octopus Adventurer's Airship Aegar, the Freezing Flame Aesi, Tyrant of Gyre Strait Aether Syphon Agent 13, Sharon Carter Agent Venom Agent's Toolkit Akiri, Fearless Voyager Akki Ronin Alandra, Sky Dreamer Alania, Divergent Storm All-Seeing Arbiter Alphinaud Leveilleur Amber Gristle O'Maul Anax and Cymede & Kynaios and Tiro (playtest) Angelheart Vial Angelic Sell-Sword Angelic Sleuth Angler's Shield Anje Falkenrath Anje, Maid of Dishonor Anowon, the Ruin Thief Ant-Man, Reformed Rogue Aphetto Runecaster April O'Neil, Live on the Scene Aradesh, the Founder Arcades, the Strategist Archfiend of Ifnir Archivist of Oghma Archmage Emeritus Archmage of Runes Archnemesis Archon of Cruelty Argothian Enchantress Arm-Mounted Anchor Artful Looter Artist's Talent Ashiok's Reaper Ashling, Flame Dancer Ashling, Rekindled Assassin Gauntlet Astonishing Spider-Man Astral Drift Astrologian's Planisphere Atemsis, All-Seeing Atlantean Cavalry Atlantean Skirmisher Attuma, Atlantean Warlord Audacious Thief Auntie Ool, Cursewretch Aurelia, the Law Above Avarice Amulet Avatar Aang Ayara, First of Locthwain Azorius thermage Azra Oddsmaker Azula, On the Hunt B.O.B

There are a lot of assumptions here, and Im sure real statisticians are looking at this and wincing, but the point I mostly want to make with these charts is the following: If something has a 1/100 chance of occurring, and you do it 100 times, theres no guarantee of getting that 1/100 chance odds