Lifelink helps, but a surefire way to survive longer is to point aggro elsewhere
Groundskeeper Groundskeeper is your cheap, activated-ability creature for land recursion
There are also great colors to pair blue with
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Sephiroth, the Savior - Atraxa, Grand Unifier (Showcase) Selling/Trading Grading Scale When selling individually or trading singles, use these price ranges as a gauge
That risk can be reduced by exiling cards from their library instead of putting the cards into their graveyards, or with graveyard hate