Rulings
Q1: I have both this card and ST2-12 Matt Ishida in play. How do I activate their effects?
You can resolve their effects in any order. For example, if you're starting the turn at 1 memory, you can resolve this card's effect first to go up to 3 memory, then activate ST2-12 Matt Ishida's effect to go to 4 memory and above.
Q2: What timing does Main occur at?
Like Main effects on Option cards, you can activate these effects at any time during your main phase. However, you can't activate them to interrupt an attack or another effect.
Q3: Can I use this card's Main effect if I have a level 5 or higher green Digimon in my Breeding Area?
No, Digimon in breeding areas aren't checked by this effect.
Q4: Does this card's Start of Your Turn effect activate if it is suspended?
Yes, it does. Unless otherwise specified, cards don't lose their effects when suspended.
Q5: During my breeding phase, I hatch a level 2 Digimon from my Digi-Egg deck. I then digivolve that Digimon into a level 3 Digimon during my main phase. If I use this card's effect to move that Digimon to my battle area, can I attack with it immediately?
Yes, you can. Hatching Digimon and moving them to the battle area doesn't count as playing them, so you can attack with them immediately.
Data Sources
Mimi Tachikawa BT1-089 R [Start of Your Turn] If you have 2 or less memory， set your memory to 3.[Main] If you have a level 5 or higher green Digimon in play， you can suspend this Tamer to hatch 1 Digi-Egg card to an empty space in your breeding area， or move 1 level 3 or higher Digimon from your breeding area to your battle area. --- [Security] Play this card without paying its memory cost.
Mimi Tachikawa BT1-089 R [Start of Your Turn] If you have 2 or less memory, set your memory to 3.[Main] If you have a level 5 or higher green Digimon in play, you can suspend this Tamer to hatch 1 Digi-Egg card to an empty space in your breeding area, or move 1 level 3 or higher Digimon from your breeding area to your battle area. --- [Security] Play this card without paying its memory cost.
Mimi Tachikawa BT1-089 R
[Start of Your Turn] If you have 2 or less memory, set it to 3.
[Main] If you have a level 5 or higher {{Colour|green}} Digimon in play, by suspending this Tamer, hatch 1 Digi-Egg card to an empty space in your breeding area, or move 1 level 3 or higher Digimon from your breeding area to your battle area.
---太刀川ミミ BT1-089 R 【自分のターン開始時】メモリーが2以下のとき、3にする。【メイン】緑のLv.5以上の自分のデジモンがいるとき、このテイマーをレストさせることで、空いている自分の育成エリアにデジタマカード1枚を孵化させるか、育成エリアのLv.3以上の自分のデジモン1体をバトルエリアに移動する。 --- 【セキュリティ】このカードをコストを支払わずに登場させる。