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.) Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.
![Chord of Calling [Ravnica: City of Guilds]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/products/42a43d68-e20c-537b-a524-de43da974a9a_a7e63cb0-0e14-4f3a-b9e2-89b033cfbe24.jpg?v=1698568221&width=1445)