

Q1: There are two copies of this card in the battle area. Can I activate both of their Main effects and play one specified card with its cost reduced by the combined amount from both effects?
No, you can't. You can't simultaneously activate multiple effects that play a card.
Q2: If a Digimon with the effect "Players can't reduce play costs," such as ST12-03 Solarmon, is in the battle area, can I activate this card's Main effect and play a specified card?
You can activate it and play the card, but the cost will not be reduced.
Lv.4 Gekomon BT26-021 C Champion | Virus | Amphibian/Titan/TS [On Play] [When Digivolving] 1 of your [TS] trait Digimon's attack target can't change for the turn. [Main] [Once Per Turn] You may play 1 [TS] trait Tamer card from your trash with the cost reduced by 2. --- [All Turns] [Once Per Turn] When a Digimon attacks, by trashing 1 card in your hand, trash the bottom 2 digivolution cards of 1 of your opponent's Digimon.
Lv.4 Gekomon BT26-021 C Champion | Virus | Amphibian/Titan/TS [Digivolve] Lv.3 w/[TS] trait: Cost 2 [On Play] [When Digivolving] 1 of your [TS] trait Digimon's attack target can't change for the turn. [Main] [Once Per Turn] You may play 1 [TS] trait Tamer card from your trash with the cost reduced by 2. --- [All Turns] [Once Per Turn] When a Digimon attacks, by trashing 1 card in your hand, trash the bottom 2 digivolution cards of 1 of your opponent's Digimon.
Lv.4 Gekomon BT26-021 C champion | Virus | Amphibian/Titan/TS [Digivolve] Lv.3 w/[TS] trait: Cost 2 [On Play] [When Digivolving] 1 of your [TS] trait Digimon's attack target can't change for the turn. [Main] [Once Per Turn] You may play 1 [TS] trait Tamer card from your trash with the cost reduced by 2. --- [All Turns] [Once Per Turn] When a Digimon attacks, by trashing 1 card in your hand, trash the bottom 2 digivolution cards of 1 of your opponent's Digimon.
Lv.4 ゲコモン BT26-021 C 成熟期 | ウィルス種 | 両生類型/タイタン族/TS 【登場時】【進化時】ターン終了まで、特徴「TS」を持つ自分のデジモン1体のアタックの対象は変更されない。 【メイン】[ターン1回]自分のトラッシュから、特徴「TS」を持つテイマーカード1枚を支払うコスト-2で登場できる。 --- 【お互いのターン】[ターン1回]デジモンがアタックしたとき、自分の手札1枚を破棄することで、相手のデジモン1体の進化元を下から2枚破棄する。