Dominaria United

Choking Miasma | Sorcery | | Kicker {G} (You may pay an additional {G} as you cast this spell.) If this spell was kicked, put a +1/+1 counter on a creature you control. All creatures get -2/-2 until end of turn. | Inka Schulz

Elvish Hydromancer | Creature | Elf Wizard | Kicker {3}{U} (You may pay an additional {3}{U} as you cast this spell.) When Elvish Hydromancer enters the battlefield, if it was kicked, create a token that's a copy of target creature you control. | Fajareka Setiawan

The Weatherseed Treaty | Enchantment | Saga | Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.) I — Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. II — Create a 1/1 green Saproling creature token. III — Domain — Target creature you control gets +X/+X and gains trample until end of turn, where X is the number of basic land types among lands you control. | Livia Prima

Queen Allenal of Ruadach | Legendary Creature | Elf Noble | Queen Allenal of Ruadach's power and toughness are each equal to the number of creatures you control. If one or more creature tokens would be created under your control, those tokens plus a 1/1 white Soldier creature token are created instead. | Ekaterina Burmak

Tatyova, Steward of Tides | Legendary Creature | Merfolk Druid | Land creatures you control have flying. Whenever a land enters the battlefield under your control, if you control seven or more lands, up to one target land you control becomes a 3/3 Elemental creature with haste. It's still a land. | Howard Lyon

Uurg, Spawn of Turg | Legendary Creature | Frog Beast | Uurg, Spawn of Turg's power is equal to the number of land cards in your graveyard. At the beginning of your upkeep, look at the top card of your library. You may put that card into your graveyard. {B}{G}, Sacrifice a land: You gain 2 life. | Nicholas Gregory