Thats close enough to a Maze of Ith, but tapping for mana is a huge deal, especially if you already got any utility out of the front half
Then the active player gains priority for the first time
Whether you prefer the aggression of the Grixis Dragons deck, the inevitability of the Grixis Control deck, or one of the more in-between decks (Grixis Energy or Grixis Midrange), there's likely a Grixis build for you
When prompted to select a creature type for a card like Obelisk of Urd , creature types present in your deck will appear on top, sorted from most to least frequent, followed by all other creature types
However, to ensure he performs adequately, a few upgrades may be necessary
In all seriousness, theres tons of incredibly effective permanents to blink for absurd value, so I hope you experiment with your favorite enter-triggering cards