The best white card in MTG is Swords to Plowshares because it exiles almost any creature for just one mana, works at instant speed, and remains effective across Commander and competitive formats
It doesnt only have a strong static ability that grows the rest of your tribal deck, but it also can serve as a mana dork that doesnt get to untap whenever it attacks
On the other hand, Rydia, Summoner of Mist is only good with 5+ summons, as a 1/2 landfall rummager isnt worth a card on its own
Kenways Treasure-making ability works with Vehicles, Pirates, and Assassins, while his card-stealing ability works exclusively with Vehicles
This probably isnt as simple a starting point as a Jumpstart box, where you can shuffle two packs together and play immediately