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And though it isn't one of the specific examples listed by Magic judges, card size differences could be considered a form of marking

Ragavan, Nimble Pilferer Ragavan, Nimble Pilferer would be higher on the list if I wasnt focused on Commander

Able to regenerate and return to your hand, Golgari Grave-Troll is simply phenomenally powerful

Avacyn Restored TypeEnchantment Aura Collector Number181 Raritycommon ArtistGreg Staples Enchant creature Enchanted creature loses flying

Kitsa has vigilance, prowess, and two abilities - you can tap the otter to draw a card and then discard a card, or you can spend two generic mana and tap it to copy an instant or sorcery spell you control, with the caveat that Kitsa needs three power to do so