Planetarium of Wan Shi Tong

Imprint — When this artifact enters, each player exiles the top three cards of their library.

Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with this artifact without paying its mana cost.

When Golos enters, you may search your library for a land card, put that card onto the battlefield tapped, then shuffle.

: Exile the top three cards of your library. You may play them this turn without paying their mana costs.

When you cast this spell, you may search your library for a colorless creature card with mana value 7 or greater, reveal it, then shuffle and put that card on top.

The first creature spell you cast each turn costs less to cast.

Players can't draw cards.

At the beginning of each player's draw step, that player exiles the top card of their library. If it's a land card, the player puts it onto the battlefield. Otherwise, the player casts it without paying its mana cost if able.

, : Reveal cards from the top of your library until you reveal a nonland card. You may erase any number of words on the card, including flavor text, as long as the card still makes sense. Then cast the revised card without paying its mana cost. Put all other cards revealed this way on the bottom of your library in a random order.

Whenever you cast a spell, you get an amount of (energy counters) equal to the amount of mana spent to cast that spell.

, Pay fifty : Draw seven cards. You may cast any number of spells from your hand without paying their mana costs.