Oakenform

Flying (This creature can't be blocked except by creatures with flying or reach.) When this creature enters, another target permanent gains indestructible for as long as you control this creature. (Effects that say "destroy" don't destroy it. A creature with indestructible can't be destroyed by damage.)

Enchant creature Enchanted creature gets +2/+2 and has vigilance. (Attacking doesn't cause it to tap.)

Flying Vigilance (Attacking doesn't cause this creature to tap.)

Flying 2U: Tap target creature with flying.

Return target nonland permanent to its owner's hand.

Flying 2U: Draw a card, then put a +1/+1 counter on this creature.

Target player discards two cards.

Flying (This creature can't be blocked except by creatures with flying or reach.) Nightmare's power and toughness are each equal to the number of Swamps you control.