Whenever an equipped creature you control attacks, you draw a card and you lose 1 life.
Equipment you control have equip Knight .
Syr Gwyn is a Mardu equipment-Voltron deck that loads up Knights and big bodies with cheap or free Equipment, swings wide with vigilance/menace, and refills your hand off the attack trigger. You ramp into Gwyn early, deploy efficient Equipment plus Knight payoffs, and use the free Knight equip cost to suit up multiple attackers in a single turn for lethal commander damage or a wide alpha strike.
Free equip on Knights lets you move buffs across the board for explosive turns
Built-in card advantage on every equipped attack keeps the hand full
Vigilance plus menace makes Gwyn both an attacker and a blocker that's hard to chump
Mardu colors give the best removal, recursion, and equipment tutors in the format
Commander-dependent: heavy investment in Gwyn is vulnerable to repeated removal and tax effects
Equipment voltron is soft to board wipes and creature-light boards leave you with dead gear
No evasion beyond menace means a single big blocker or fog can stall the alpha strike
Life loss from the attack trigger and aggressive ramp can leave you low against burn/aristocrats