Whenever Wylie Duke becomes tapped, you gain 1 life and draw a card.
Wylie Duke turns every tap into a card and a life, so you build an engine of tap-and-untap effects to draw your whole deck while flooding the board with creatures. Early turns play mana dorks and cheap value creatures, then deploy ways to repeatedly tap Wylie (convoke, crewing vehicles, tap-for-mana abilities) alongside untappers to chain triggers. You snowball card advantage into a wide go-wide GW board or a tap-loop combo finish.
Continuous card advantage attached to a cheap 3-mana commander that even draws when it attacks via tap outlets
Vigilance lets it attack while still being available to tap for value or block
Incidental lifegain stabilizes against aggro and fuels lifegain payoffs
Low mana value makes it easy to recast through removal
Slots into go-wide GW shells that already run convoke and token engines
Engine stalls hard without dedicated tap/untap enablers in play
Removal-heavy tables can repeatedly answer a creature you depend on for card flow
No built-in evasion or protection, so it dies to chump-friendly boards and spot removal
GW lacks interaction depth, leaving you light on counterspells and instant-speed answers
Drawing extra cards without payoffs can deck you out in long tap-loop turns