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Only against Mono-Red Aggro do you really feel the pain from Notion Rain, and if the deck was more popular, there would be a discussion to reduce the number used

If a creature entering the battlefield has riot but can't have +1/+1 counters put on it, it gains haste

While some reprints do hurt the value of cards without actually adding much to Standard (Meddling Mage, Nantuko Shade, Haunting Echoes, etc.), the majority of reprints help bring new life to old cards

The free Gallery caps at 100 cards, so if you were creating, say, a 250-card custom Limited set, expanding that option could be useful

The effect of Illusions of Grandeur is pretty simple -- you gain 20 life as long as the enchantment is in play, but you lose it when it's gone, because it's an illusion after all