Suit up Gregor with auras, equipment, and counter pumps so his combat damage refills your hand each turn, while skulk keeps him hard to block. Use the cards you draw to deploy protection and control elements, eventually closing through an oversized evasive Gregor or with the resources you accumulate. You're playing a value-Voltron deck that snowballs card advantage into an unstoppable board state.
Repeatable, scaling card draw that outpaces every opponent's hand size
Skulk makes him naturally evasive against go-wide and small-creature boards
Cheap 3-mana commander, so he's easy to redeploy after removal
UW gives premium protection and counterspells to keep him alive
Highly commander-dependent; removal-heavy tables can grind you out
Skulk fails against decks with large blockers or fliers/reach you can't outsize
Pumping power too high can make skulk worse, requiring evasion instead
No built-in board wipe protection beyond what you draw