While theres a lot of synergy here, the cards are mostly strong independently, and the deck is designed to play a fair, interactive game that just happens to be able to gain infinite life with Urza and the Thopter Foundry / Sword of the Meek Combo, but mostly Urza, Oko, and Emry are all amazing standalone cards that require fairly different answers
Vigilance : Until end of turn, other Elves you control gain vigilance and get +1/+1 for each +1/+1 counter on Haldir
And it happens at an instant speed
Then counter up to one target spell unless its controller pays mana equal to the greatest power among creatures you control
Those characters will feature in Borderless Character Cards, Borderless Woodblock Cards inspired by Japanese woodblock paintings, and Borderless Final Fantasy Artist cards
And it can become real card advantage if you discard cards with graveyard mechanics like flashback or unearth, or big creatures in a reanimator deck