Featuring awesome artwork by Pete Venters of an armor-plated Treefolk brandishing a rootlike sword and rallying the troops (i.e., trees), this card has never seen a reprint in paper (and never will due to being on the Reserved List)
You get to slip the Gateway Sneak by your opponents defenses when a Gate enters the battlefield under your control since you can make it unblockable, a neat trick to push the game in your favor

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Your hand: Opponents hand: Generally speaking, Underworld Connections is one of the best cards against U/W/R, but the key to this situation is that you need to ignore it, at least for the time being
That honor goes to the handful of common flip Sagas we got in Kamigawa: Neon Dynasty
All you need is some practice and picking the best combinations and cards