Q1: "I chose 1 of my opponent's Digimon with 3 or fewer digivolution cards as the target for ""can't attack until the end of your opponent's turn"" in this card's inherited effect. Then, that opponent's Digimon digivolved and its digivolution cards increased to 4 or more. What happens to the ""can't attack until the end of your opponent's turn"" effect?"
The "can't attack" effect won't end until the end of your opponent's turn, even if the digivolution cards increase to 4 or more.
Lv.5 MetalGreymon EX4-020 R Ultimate | Virus | Cyborg/Blue Flare [On Play] This Digimon gains <Rush> for the turn. (This Digimon may attack the turn it was played.) If DigiXrosing, trash up to 2 digivolution cards of 1 of your opponent's Digimon. <Material Save 2> (When this Digimon would be deleted, you may place 2 cards in this Digimon's DigiXros conditions from this Digimon's digivolution cards under 1 of your Tamers.) --- Inherited: [When Attacking] If this Digimon is [GreyKnightsmon], 1 of your opponent's Digimon with 3 or fewer digivolution cards can't attack until the end of your opponent's turn.
Lv.5 MetalGreymon EX4-020 R Ultimate | Virus | Cyborg/Blue Flare DigiXros -2: Blue [Greymon] × [MailBirdramon] [On Play] This Digimon gains <Rush> for the turn. (This Digimon may attack the turn it was played.) If DigiXrosing, trash up to 2 digivolution cards of 1 of your opponent's Digimon. <Material Save 2> (When this Digimon would be deleted, you may place 2 cards in this Digimon's DigiXros conditions from this Digimon's digivolution cards under 1 of your Tamers.) --- Inherited: [When Attacking] If this Digimon is [GreyKnightsmon], 1 of your opponent's Digimon with 3 or fewer digivolution cards can't attack until the end of your opponent's turn.
Lv.5 MetalGreymon EX4-020 R Ultimate | Virus | Cyborg/Blue Flare [On Play] This Digimon gains <Rush> for the turn. Then, if DigiXrosing, trash up to 2 digivolution cards of 1 of your opponent's Digimon. <Material Save 2>. {{DigiXros|2|{{Colour|Blue}} [Greymon] x [MailBirdramon]}} --- Inherited: [When Attacking] If this Digimon is [GreyKnightsmon], 1 of your opponent's Digimon with 3 or fewer digivolution cards can't attack until the end of your opponent's turn.
Lv.5 メタルグレイモン EX4-020 R 完全体 | ウィルス種 | サイボーグ型/ブルーフレア 【登場時】このターンの間、このデジモンは≪速攻≫(このデジモンは登場したターンでもアタックできる)を得る。デジクロスしていたなら、相手のデジモン1体の進化元を、選んで2枚まで破棄する。 ≪マテリアルセーブ2≫(このデジモンが消滅するとき、このデジモンのデジクロス条件にある進化元のカード2枚を自分のテイマー1体の下に置ける) --- Inherited: 【アタック時】このデジモンが「グレイナイツモン」なら、進化元が3枚以下の相手のデジモン1体は次の相手のターン終了までアタックできない。