Check with your friends if you have any concerns, but most people wont mind
So, for some harder changes, I recommend: -1 Dragon Pulse, and -1 or 3 Odd-Eyes +2 Xiangke Magician - its level, typing, and attribute compliment Dark Magician stuff very well, and his quick-play effect to negate effects comes in handy in a lot of situations
Generally, the rarer the misprint, the more its worth to the right buyer
Attack with a creature, like Gonti, copy the myriad trigger with Strionic Resonator (since myriad says Whenever) to get double the attacking tokens, and then Panharmonicon gives you double for the attacking creatures
Five mana is a great rate for seven power and toughness, but Reggie's main role is enabling other hasty attackers
If you want a discount, then LP copies sit just below the $100 mark, followed by MP cards, which fetch about $64 and offer a much more affordable bar of entry