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I suspect the ability forcing you to sacrifice lands would be seen as a drawback, meriting the mana cost reduction

As a general rule, you should only draw one type of Pokmon per illustration

And for anyone not familiar with the news of the London Mulligan, heres how it works (taken from the official WotC announcement): When you mulligan for the Nth time, you draw seven cards, then put N cards on the bottom of your library in any order.

Where do you even begin

The other new mechanic is tiered, which appears only on instants and sorceries and grants them scaling power throughout the game

It can also be used as a simplistic deck designer and an intricate database for a primer