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This could very well be a future where Mirrodin was reclaimed by Phyrexia and the Mirarris goblin population would benefit from that

This can make wrath effects useless along with putting a huge clock on your opponent

For Gruul, you want to be able to ramp up to the point where you can cast your big creatures and for a little mana you can do just that

Here you can draft a slow blue control deck full of Accumulated Knowledges, Counterspells, and Excludes one draft, then gum up the ground with high-toughness creatures and win with fliers the next

It was obviously better to have these cards, which are often played purely for their enters-the-battlefield effects, enter on your side as the casting player