Psychic Venom has nothing to do with snakes, but I like the symbolic piece of artwork of how the Blue Mage is making one of the opponents' cards poisonous to them
Importantly, blinking a planeswalker allows you to activate its loyalty abilities again since the game sees it as a brand new permanent
Aesi draws you a card whenever you have lands enter the battlefield and lets you play one extra land per turn
Green is also exceptional at creating an immense mana advantage, typically with cheap cards like mana dorks (Llanowar Elves, Badgermole Cub) and land-based ramp, which is pretty unique to green (Rampant Growth, Cultivate)
Sure, you could squeeze a little extra value out of a Genesis Wave, Torment of Hailfire or any other X spell, but doubling down on Hydras would be a fun way to go
You can play this black ramp piece in other color combinations thanks to Urborg, Tomb of Yawgmoth, but those decks make this black land a weak half of a 2-card combo