After the resolution of the triggered ability, Gwenom lets you look at the top card of your library whenever you want (with one restrictionsee below), even if you don't have priority
9 | Spelunking: $2.90 Spelunking is one of the most impactful cards on this list from a competitive standpoint
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See, you can always copy a Creature with a strong enters-the-battlefield or death trigger, then let the token copy get sacrificed and store your two Energy for later
You could easily cast an aura to lock down a troubling creature and then buff Light-Paws at the same time
There are many other cards that are slam dunks for this archetype - Ultros, Obnoxious Octopus, Blazing Bomb, and more - so Ill just add that youll want to pick up Equipment and Tiered spells