March of the Machine

Artistic Refusal | Instant | | 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.) Choose one or both — • Counter target spell. • Draw two cards, then discard a card. | Olivier Bernard

Complete the Circuit | Instant | | 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.) You may cast sorcery spells this turn as though they had flash. When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies. | Eelis Kyttanen

Thunderhead Squadron | 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 | PINDURSKI

Tidal Terror | Creature | Octopus | Whenever Tidal Terror attacks, you may tap two other untapped creatures you control. If you do, Tidal Terror can't be blocked this turn. Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.) | Nicholas Gregory