The Stripe Mine #175 is one of the few foil copies of Strip Mine out there, and is one of the best hits available in the Stellar Sights bonus sheet
So when your summon's time is up and it goes to the graveyard, it's going to trigger Yuna, and she'll pop three or four +1/+1 counters onto another creature, powering it up
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This allows efficient one-mana spells such as Lightning Bolt to deal six damage rather than six, and higher-mana creatures that cost three, five, and seven mana to deal absurd amounts of damage
The best blue creatures MTG has produced, like Snapcaster Mage and True-Name Nemesis , complement these mechanics perfectly