The planes chaos ability - activated when the planeswalker symbol is rolled on the planar die - gives the player control of a target artifact before planeswalking to a new location as usual
Emerald is typically an ink colour that feels classically mischievous, punishing opponents by forcing them to discard cards, lose characters and even lore
(2025-06-06) If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion
Bouncing rocks in red
Of course, there are stories of this thing completely changing the game, but in general, there is usually enough enchantment removal floating around that most of the time this will probably do nothing (expect possibly draw out that enchantment removal, but you dont usually want to approach the game like that, especially in multiplayer)
We then made the front of the card a tutor (a card that fetches a card from your library and puts it into your hand) that could go get one of three subtypes, not only all things found on Theros, but also all enchantments on Theros