Magic the Gathering: Regeneration?

Ok so I'm pretty new at the game still and just got through playing a game with my gf. She plays g/w and I play blue/black. Just to experiment, I threw a couple of black creatures with regenerate ( Drudge Skeletons and Wall of Bone, I believe) and she had a hard time as everytime she attacked with her... show more Ok so I'm pretty new at the game still and just got through playing a game with my gf. She plays g/w and I play blue/black. Just to experiment, I threw a couple of black creatures with regenerate ( Drudge Skeletons and Wall of Bone, I believe) and she had a hard time as everytime she attacked with her mana-heavy green creatures I just blocked and regenerated with those two.
Can someone explain a strategy for defeating regen creatures? Or am I using them wrong?
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