Some cards that I think could build out this shell: Ugin, Eye of the Storm Summon: Bahamut Solemn Simulacrum Adventurer's Inn The Irencrag Sire of Seven Deaths Mazemind Tome Fountainport Jill, Shiva's Dominant & Joshua, Phoenix's Dominant Jill and Joshua are two cards that feel powerful enough in Standard, that feel like they slot into a number of already existing archetypes
Some decks will be very happy with it, while others wont care too much
Recent decks, like the Emerald/Amber option from Whispers in the Well or the Amber/Ruby Pirate deck from Azurite Sea, are balanced, ready to play right out of the box, and give you a solid feel for how different ink colors work together
Characters with vanish can hit harder, but are more easily banished - that's if you're not an evil, illusion-slinging vizier, that is