Add in existing archetypes that already used the card, like Broodscale Combo and Amulet Titan, and Urzas Saga has become a pillar in the Modern metagame
While its not guaranteed to get all your Humans off of Adeline, due to them being chump blocked and youll be cashing in the tokens from Kykar to cast spells, more than likely this is still a super strong enchantment that many, many decks can capitalize on
If you don't have access to Squall, you'll have to use your suite of control cards to slow your opponents down until you can cast Squall.
Oh, wait After dominating Modern alongside Field of the Dead and Urza, Lord High Artificer, Wizards said enough was enough and banned the powerful Titan
The flashback also serves double duty here, both synergising with self-mill decks and allowing double value if you do happen to draw the card rather than mill it.
Esper Sentinel overshot a bit