Duelist's Heritage
1:
-Had both "Duelist's Heritage" and "Heliod, Sun-Crowned" on the board with "Sentinel's Eyes" equipped (+1/1 and Vigilance).
-As Heliod attacked, I had DH give him Double Strike.
-Opponent [Eternal Archimage#18080] was using an elf deck and blocked with "Allosaurus Shepherd."
-First strike damage killed AS.
-But HSC did not deal regular damage to opponent.
-On the next attack, I repeated the DH granting double strike to HSC.
-Opponent blocked with a basic elf.
-Same thing: FS damage but not regular damage.
-It seems DH was only granting first strike.
-Opponent had on board, "Marwyn, the Nurturer," "Steel Leaf Champion," and "Dwynen's Elite." Nothing that would stop double strike.
2: Mac
3: Instead of double strike, creature was only doing first strike damage.
4: Double strike damage.
5: Was so confused I forgot.
6: I still won, if you consider that a workaround. Probably not.