Grass: Joining the original line-up of types in the Pokmon TCG Base Set, Grass represented a combination of Grass, Poison and Bug Pokmon from the video games
When a card says Gift a tapped Fish, it means that you may choose an opponent, and if you do, that player creates a tapped 1/1 blue Fish creature token once the spell resolves
When this card is destroyed by battle: You can Special Summon 3 "Legendary Knight" monsters from your hand, Deck, and/or GY, ignoring their Summoning conditions
Part of the reason is simple economics: high demand and limited supply
the internet is saying Firesong and Sunspeaker is the best Boros commander ever
This doesnt even cover how well these two synergize with Jhoira of the Ghitu