Soulbound Bond

Indestructible, Shroud
If you have Pichu, but not Stecca in control,
Pichu gains: {t}: exile a creature
If you have Stecca, but not Pichu in control,
Stecca gains +4/+4 and {1}: regenerate
If you have both Pichu and Stecca in control,
both gain the other's abilities and gain +1/+1