''Drill Synchron" + 1 or more non-Tuner monsters.
Once per turn, during your Main Phase, you can halve this card's ATK (permanently). If you do, it can attack your opponent directly this turn. Once per turn, during your Main Phase, you can discard 1 card and remove this card from play. During your next Standby Phase, Special Summon this card, if removed by this effect. Then, add 1 Monster Card from your Graveyard to your hand.
Can the ''Main Phase'' effect can be used at Main Phase 1 and 2?