Soulflayer

[delregnr]

If I cast Soulflayer and delve away Fleecemane Lion and Warden of the First Tree will soulflayer gain indestructible, hexproof, trample or Lifelink ?

[Avodroc13]

If I cast {Soulflayer} and delve away {Fleecemane Lion} and {Warden of the First Tree} will soulflayer gain indestructible, hexproof, trample or Lifelink ?

Please use curly brackets to link cards.

And no, when you use monstrosity for the lion, it's ideally for when it's on the battlefield. It doesn't retain activated abilities when it leaves the battlefield.
Same is true for the tree.
It would work with something like {Goblin Striker}. If you delve {Goblin Striker}, the {Soulflayer} would gain first strike and haste. Hope this helps.

[delregnr]

Yes. Thank you.  That is what I thought but you can always hope for a miracle.  {soulflayer}

[Kaylesh]

Confirming from gatherer rulings:
Creature cards that have abilities that grant the listed keyword abilities to themselves won't count. For example, exiling a Battle Brawler (a creature with "As long as you control a red or white permanent, Battle Brawler gets +1/+0 and has first strike") with Soulflayer's delve ability won't cause Soulflayer to have first strike, even if you control a red or white permanent.