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They are just simple ways to do simple things nice and cost effectively

This can destroy certain decks that need their mana for other things such as casting creatures, and can force them to budget their mana a lot more than they usually would while you just continue playing (assuming youre playing a deck that is big on mana, that is, otherwise this will greatly affect you too)

Knight of Hanoi [Key Point] Being able to Fusion and Link Summon during your opponents turn is utterly fascinating

While Dobermon's sacrifice gives Takato, Henry, Rika, and Ryo the ability to BioMerge with their partners in the real world, and become Gallantmon, MegaGargomon, Sakuyamon, and Justimon, it doesn't give them any protection against the D-Reaper, and its ability to delete anything it touches

It might even reduce the number of Lessons you want since a free 2/2 haste creature is better than any Lesson you could find