Ghalta, Primal Hunger

For each land you control, create a Treasure token. (It's an artifact with "T, Sacrifice this token: Add one mana of any color.")

Enrage — Whenever this creature is dealt damage, each opponent sacrifices a permanent of their choice.

Enchant creature an opponent controls When enchanted creature dies, exile cards equal to its power from the top of its owner's library. You may cast spells from among those cards for as long as they remain exiled, and mana of any type can be spent to cast them.

Exile target nonland permanent. For as long as that card remains exiled, its owner may cast it without paying its mana cost.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) You may play an additional land on each of your turns. This creature can't attack or block unless you have the city's blessing.

Whenever another Merfolk you control enters, put a +1/+1 counter on target Merfolk you control.

Flying When Azor enters, each opponent can't cast instant or sorcery spells during that player's next turn. Whenever Azor attacks, you may pay XWUU. If you do, you gain X life and draw X cards.

Whenever Etali attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs.