

Q1: I have a suspended Shoutmon EX6 and an unsuspended ShootingStarmon. If I choose the 2nd effect for this card's Main effect, can I just unsuspend Shoutmon EX6 and attack with 1 of my Digimon?
No, you can't. A "by doing X" condition can't be met if only some of the required actions are performed. The conditions for this card's Main effect require you to suspend both 1 of your Shoutmon EX6 and 1 of your ShootingStarmon.
Meteor Rock Soul BT19-090 C Xros Heart [Main] Activate 1 of the effects below. • You may play 1 [Xros Heart] trait Digimon card with 4000 DP or less from under your Tamers without paying the cost. • By unsuspending 1 of your [Shoutmon EX6] and 1 of your [ShootingStarmon], 1 of your Digimon may attack a player. --- [Security] You may play 1 [Xros Heart] trait Digimon card with 4000 DP or less from under your Tamers without paying the cost.
Meteor Rock Soul BT19-090 C Xros Heart [Main] Activate 1 of the effects below. • You may play 1 [Xros Heart] trait Digimon card with 4000 DP or less from under your Tamers without paying the cost. • By unsuspending 1 of your [Shoutmon EX6] and 1 of your [ShootingStarmon], 1 of your Digimon may attack a player. --- [Security] You may play 1 [Xros Heart] trait Digimon card with 4000 DP or less from under your Tamers without paying the cost.
Meteor Rock Soul BT19-090 C Xros Heart [Main] Activate 1 of the following effects: • You may play 1 Digimon card with the [Xros Heart] trait and 4000 DP or less from under your Tamer without paying the cost. • By unsuspending 1 of your [Shoutmon EX6] and 1 of your [ShootingStarmon], attack a player with 1 of your Digimon. --- [Security] You may play 1 Digimon card with the [Xros Heart] trait and 4000 DP or less from under your Tamer without paying the cost.
リュウセイロックダマシー BT19-090 C クロスハート 【メイン】以下の効果から1つを発揮する。 • 自分のテイマーの下から、特徴に「クロスハート」を持つDP4000以下のデジモンカード1枚をコストを支払わずに登場できる。 • 自分の「シャウトモンEX6」と「シューティングスターモン」1体ずつをアクティブにすることで、自分のデジモン1体でプレイヤーにアタックできる。 --- 【セキュリティ】自分のテイマーの下から、特徴に「クロスハート」を持つDP4000以下のデジモンカード1枚をコストを支払わずに登場できる。