While it's an oversimplification to attribute these gains to a single set or event, the Pokemon Company continues to build momentum with each major announcement, setting a new standard for modern cards
The mana value of the spell that caused the ability to trigger is determined only by its mana cost, no matter what the total cost to cast the spell was
Its one of the most popular Selesnya commanders for a reason
its only stated rule is that cards are inserted at random
If you're solely interested in trying out the new cards from the latest set, then this is the perfect method for you to try without breaking the bank
On the other hand, because of my shortage of early plays, getting mana hosed was very possible, and would be particularly devastating