Guilds of Ravnica

Flight of Equenauts | Creature | Human Knight | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Flying | Zezhou Chen

Lotleth Giant | Creature | Zombie Giant | Undergrowth — When Lotleth Giant enters the battlefield, it deals 1 damage to target opponent for each creature card in your graveyard. | Alex Konstad

Arboretum Elemental | Creature | Elemental | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Hexproof (This creature can't be the target of spells or abilities your opponents control.) | James Paick

Hatchery Spider | Creature | Spider | Reach Undergrowth — When you cast this spell, reveal the top X cards of your library, where X is the number of creature cards in your graveyard. You may put a green permanent card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order. | Livia Prima

Siege Wurm | Creature | Wurm | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Trample | Filip Burburan

Flower // Flourish | Sorcery // Sorcery | | Search your library for a basic Forest or Plains card, reveal it, put it into your hand, then shuffle. // Creatures you control get +2/+2 until end of turn. | Dmitry Burmak

Invert // Invent | Instant // Instant | | Switch the power and toughness of each of up to two target creatures until end of turn. // Search your library for an instant card and/or a sorcery card, reveal them, put them into your hand, then shuffle. | Mathias Kollros

Molderhulk | Creature | Fungus Zombie | Undergrowth — This spell costs {1} less to cast for each creature card in your graveyard. When Molderhulk enters the battlefield, return target land card from your graveyard to the battlefield. | Titus Lunter