Strategic selling opportunities include: Before new set releases when interest in older cards peaks During anniversaries or media events that boost nostalgia When supply diminishes, especially for limited print runs Economic downturns often present buying opportunities, whilst market booms provide ideal selling windows
If your card is niche and might take weeks to find a buyer, factor that timeline into your decision
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While every card in an Un-set, outside of some fancy Basic Lands, was considered unplayable for quite some time, there are now some select cards from Un-sets that are legal for sanctioned play
Ancient Copper Dragon is a powerhouse, and it seems to be in such large demand that its pre-release price has actually been increasing Dragon of Mount Gulg was around $150 in mid-May, but now it's close to $200
Eminence is an inherently powerful ability, and I've played many games where Edgar didn't even need to leave the Command Zone to win the game