Banned Eldraine Card

As an additional cost to play Banned Eldraine Card, pay {B}, {3}{R}{G}, {3}{R}, {2}, {0}, or {1}{G}. It becomes a copy respectively of Cauldron Familiar, Escape to the Wilds, Fires of Invention, Lucky Clover, Mystic Sanctuary, Once Upon A Time for the rest of the game in all zones. (You can't choose Oko. Because let's be real, nobody wants to play against Oko again.)

Arteeoh, Dread Scavenger

Flying, deathtouch
Whenever Arteeoh deals combat damage to a player, you may exchange control of two other target artifacts. When you do, create a token that's a copy of target artifact you don't control, except it's a 1/1 green Squirrel creature token in addition to its other colors and types.

Baron Von Count

Baron Von Count enters with a doom counter on "5."
Whenever you cast a spell with the indicated numeral in its mana cost, text box, power, or toughness, move the doom counter one numeral to the left.
When the doom counter moves from "1," destroy target player and put that doom counter on "5."

Alexander Clamilton

Whenever you cast a wordy spell, scry 2. (A spell is wordy if it has four or more lines of rules text.)
{1}{R}, {T}: Choose target creature you don't control. Reveal the top card of your library. Alexander Clamilton gets +X/+0 until end of turn, where X is the number of lines of rules text of the revealed card. Alexander Clamilton fights that creature.

Go-Shintai of Life's Origin

{W}{U}{B}{R}{G}, {T}: Return target enchantment card from your graveyard to the battlefield.
Whenever Go-Shintai of Life's Origin or another nontoken Shrine you control enters, create a 1/1 colorless Shrine enchantment creature token.