Abilities that trigger when a creature becomes tapped won't trigger when a creature phases in tapped
In the same way, Id caution against taking any deal for a Black Lotus thats unreasonably undervalued, dont trust someone offering to sell you an expensive booster box for half the market price
On the next turn, you might grab Mana Vault or Mystic Remora if you also have Blue in your commander's identity

Adrenaline Jockey Ahn-Crop Crasher Ahn-Crop Invader Akoum Warrior Anaba Ancestor Anaba Bodyguard Anaba Shaman Anaba Spirit Crafter Ardent Dustspeaker Barging Sergeant Blaze Commando Bloodrage Brawler Borderland Minotaur Boros Battleshaper Boros Reckoner Boros Strike-Captain Bull-Rush Bruiser Burning-Fist Minotaur Canyon Minotaur Coalition Warbrute Cursed Minotaur Deadshot Minotaur Deathbellow Raider Dreamshaper Shaman Emberhorn Minotaur Etherium-Horn Sorcerer Fanatic of Mogis Felhide Brawler Felhide Minotaur Felhide Petrifier Felhide Spiritbinder Firesong and Sunspeaker Frontline Devastator Glint-Horn Buccaneer Gnarled Scarhide Gorehorn Minotaurs Gorehorn Raider Gornog, the Red Reaper Grisly Survivor Hellspur Brute Hostile Minotaur Hurloon Minotaur Hurloon Shaman Hurloon Wrangler Karplusan Minotaur Kazuul Warlord Kragma Butcher Kragma Warcaller Labyrinth Adversary Labyrinth Minotaur Lightning Visionary Longhorn Sharpshooter Lord of Shatterskull Pass Maelstrom Artisan Magar of the Magic Strings Marauding Boneslasher Merciless Javelineer Minotaur Abomination Minotaur Aggressor Minotaur Explorer Minotaur Illusionist Minotaur Skullcleaver Minotaur Sureshot Minotaur Tactician Minotaur Warrior Minotaur de Force Minotaur, ROXXON CEO Moraug, Fury of Akoum Neheb, Dreadhorde Champion Neheb, the Eternal Neheb, the Worthy Nyxborn Marauder

(Plus Merlin, Shapeshifter in his own human form.) Each of the shapeshifting Merlin cards offers a different boon when they first arrive on the table and when they leave, presenting the opportunity to combine them with cards that cycle them in and out of your hand to stack up the benefits