Pivoting as a set:

2/0 spell, target dragon becomes nymph, or target nymph becomes dragon

dragons come into play with mutant abilities

perm, costs -1/-2: when a dragon dies, shuffle a bone dragon into your deck

spell, costs 8/6: convert all quanta to element of target dragon (?)

perm, ??

spell, costs 2/1: target a dragon, summon a dragon egg with ability costing 2 of target's element 'become a dragon'

creature, costs 4/4 2|2 3|3 ability 'dragon breath' 3/2: if you have a dragon on the field, deal 2|3 damage to target creature & 1 to its allies

spell, freeze all non dragons

creature 1/1 or 8/8, target dragon becomes light producing. Light producing dragons something something ??

??

spell costs 2/1: draw a dragon. Or maybe sacrifice dragon, shuffle 2 copies back into deck, draw 3 dragons. Or maybe a perm "If you draw the last card of your deck & it's a dragon, you win the game"

spell, costs 5/3: sacrifice a dragon, heal to full, then gain sacrifice status until your next turn (?)

creature costs 7/7 5|5? / 7|6?: while you have a dragon on the field, instances don't enter with summoning sickness