Honorable Mention: Sorcerer Role Token Assign the Sorcerer Role to a creature you want to attack consistently with
What makes a serialized card unique is that these special cards have an individual serial number printed on the front like the one below: It appears WotC has taken a page from the Sports Card Industry and decided to give it a try in Magic The Gathering
Before we go any further: we're going to assume you already know what your cards are worth
Urza, Lord Protector is an obvious place to start, discounting all the non-creature (and non-planeswalker) spells you want in that kind of deck
Solgaleo 44 Lapras Water 110 Surf (70) Both 45 Popplio Water 60 Sing Your opponent's active Pokmon is now Asleep
You might be thinking "Just play Looters," to which I say, "Of course, but a lot of Looters need to tap!" The Mystic requires mana, but no tapping, so you can cycle as long as you have mana and a creature to discard, which can be huge in the late game