Mæknoë, ancient earth

Trample, convoke
When Maeknoe enters the battlefield, mill 20 cards
For each card type milled this way,
• add 1 mana of any color for each land
• deal 3 damage to any target for each artifact or enchantment
• gain 4 life for each creature
{bull} if 5 or more instants and sorceries are milled this way,
return target permanent from your graveyard to the battlefield under your
control
— power toughness equal to the number of cards in your gravyard