

Q1: Can I declare activation of this card's {Hand} Main effect even when I don't have King Drasil_7D6 or Mother Eater in the breeding area?
No, you can't.
Q2: Can I pay 3 cost for this card's {Hand} Main effect but choose to not place this card as the bottom digivolution card of my King Drasil_7D6 or Mother Eater in the breeding area?
No, you can't. A "by" condition can't be met if only some of the required actions are performed. In order for the conditions for this card's {Hand} Main effect to be met, you must pay 3 cost and place this card as the bottom digivolution card of your King Drasil_7D6 or Mother Eater in the breeding area.
Q3: Does this card's All Turns effect also trigger when this card itself is played?
Yes, it triggers.
Q4: What is a {Breeding} effect?
A {Breeding} effect can be triggered/activated while its card is in the breeding area. Such effects can't be triggered or activated in areas other than the breeding area.
Lv.- King Drasil_7D6 BT23-072 R
Mega | Unknown | 9000/CS
{Hand} [Main] By paying 3 cost and placing this card as the bottom digivolution card of your [King Drasil_7D6] or [Mother Eater] in the breeding area, <Draw 1>.
[All Turns] When any of your Digimon with the [Royal Knight] or [CS] trait are played, by suspending this Digimon, 1 of the played Digimon gains <Rush>, <Raid>, <Reboot> and <Blocker> until your opponent's turn ends.
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{Breeding} [Start of Your Main Phase] If this Digimon has 6 or more digivolution cards, you may play 1 Digimon card with [King Drasil] in its name from its digivolution cards without paying the cost.Lv.- King Drasil_7D6 BT23-072 R
Mega | Unknown | 9000/CS
{Hand} [Main] By paying 3 cost and placing this card as the bottom digivolution card of your [King Drasil_7D6] or [Mother Eater] in the breeding area, <Draw 1>.
[All Turns] When any of your Digimon with the [Royal Knight] or [CS] trait are played, by suspending this Digimon, 1 of the played Digimon gains <Rush>, <Raid>, <Reboot> and <Blocker> until your opponent's turn ends.
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{Breeding} [Start of Your Main Phase] If this Digimon has 6 or more digivolution cards, you may play 1 Digimon card with [King Drasil] in its name from its digivolution cards without paying the cost.- King Drasil_7D6 BT23-072 R Mega | Unknown | 9000/CS [Hand] [Main] By paying 3 cost and placing this card as the bottom digivolution card of your [King Drasil_7D6] or [Mother Eater] in the breeding area, <Draw 1>. [All Turns] When any of your Digimon with the [Royal Knight] or [CS] trait are played, by suspending this Digimon, 1 of the played Digimon gains <Rush>, <Raid>, <Reboot> and <Blocker> until your opponent's turn ends. --- [Breeding] [Start of Your Main Phase] If this Digimon has 6 or more digivolution cards, you may play 1 Digimon card with [King Drasil] in its name from its digivolution cards without paying the cost.
Lv.- イグドラシル_7D6 BT23-072 R
究極体 | 不明 | 9000型/CS
{手札}【メイン】3コスト支払い、このカードを育成エリアの自分の「イグドラシル_7D6」/「マザー• イーター」の進化元の下に置くことで、≪1ドロー≫。
【お互いのターン】特徴に「ロイヤルナイツ」/「CS」を持つ自分のデジモンが登場したとき、このデジモンをレストさせることで、相手のターン終了まで、登場したデジモン1体は≪速攻≫と≪突進≫と≪再起動≫と≪ブロッカー≫を得る。
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{育成}【自分のメインフェイズ開始時】このデジモンの進化元が6枚以上なら、このデジモンの進化元から、名称に「イグドラシル」を含むデジモンカード1枚をコストを支払わずに登場できる。