UB seems to be about doing combat damage to an opponent and getting triggers out of it, and Krydle definitely showcases how great that can be
[Card]Aetherworks Marvel[/Card] [Card]Dig Through Time[/Card] [Card]Smugglers Copter[/Card] [Card]Emrakul, the Promised End[/Card] [Card]Emry, Lurker of the Loch[/Card] [Card]Felidar Guardian[/Card]/[Card]Saheeli Rai[/Card] [Card]Kethis, the Hidden Hand[/Card] [Card]Mox Amber[/Card] [Card]Narset, Parter of Veils[/Card] [Card]Nexus of Fate[/Card] [Card]Oko, Thief of Crowns[/Card] [Card]Once Upon a Time[/Card] [Card]Prized Amalgam[/Card] [Card]Teferi, Time Raveler[/Card] [Card]Treasure Cruise[/Card] This is my to do list
In multicolor builds, a stable mana base matters just as much, since good fixing and efficient dual lands keep your Angels castable on curve
Usually its life, but the first card draw for black was something completely different, something they just dont do anymore
Given the low opportunity cost of running it, Id say the land version was even better
Theres a little bit of Item lock with Cryogonal, but its used mostly to slow down the opponent on turn 1, not to lock them out of the game