This card represents a magical glen where these faeries emerge from their hiding places among the flowers
Only 3 Nissa seems kinda odd and I did play 4 for a very long time but it was kinda clunky for me in many occasions people play cards like Mystical Dispute, Aether Gust, Negate and drawing 2 or 3 Nissa often forces you to make unfavorable plays
Tiduss mechanics of passing counters around is a reference to the sphere grid and I believe the card draw is a representation of scoring points in Blitzball
When I look at the formats page, there are seven listed Commander, Standard, Vintage, Legacy, Modern, Block, Team Unified Constructed
To turn Blighted Agent into a threat, they can easily be scaled, making their Infect that much more dangerous