Forum:About Crystal Abundance

i have a hard time understanding its effect

i have a friend with his main deck called crystal beast deck

everytime he uses Crystal Abundance, he always pick 4 crystal beasts from his field and destroy all my cards on the field

so my question is can he resummon the crystal beasts he sacrifice by the effect of crystal abundance and special summon it by the effect of crystal abundance?

because its unfair, its just like activating harpies feather duster and raigeki and he directs all his crystal to my lifepoints making my lifepoints 0