The Dash ability of Ragavan, Nimble Pilferer gives the card even more flexibility to attack out of surprise, which leads the opponent to never be sure about clearing the board or attacking without leaving a blocker behind
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Trample
Each Collector Booster contains 15 Magic: The Gathering cards and 1 Traditional Foil double-sided token, with a combination of 57 cards of rarity Rare or higher and 35 Uncommon, 36 Common, and 1 Land cards
If you could reliably cast this off of a Mountain, a Forest, and a Swamp, that would be great, but that's not an option
It's worth noting that this can't reduce the cost of the Seek Thrills half of the card, or any other adventure, for that matter, because, as of now, none are permanents
At the very least, I expect Organic Extinction, maybe Their Name Is Death