During Your Turn: I chain
Magic Drain to Insect Barrier.
And the monster you attacked was actually MY prickle fairy, so it lives and your ant goes to Defense.
During Mine: Draw one.
If you didn't discard for Magic Drain, here's what I'll do:
Summon
Swarm of Locusts In attack mode.
Switch Man-Eater Bug to attack, and destroy your Prickle Fairy.
Attack and destroy your defense mode Anteatereatingant with swarm of Locusts.
Your LP: 6600
If you discarded:
Summon
Swarm of ScarabsIn attack Mode and end my turn.