At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.
Given the rarity and limited information on some bonus cards, this may not be a complete list of all potential bonus cards available in this Secret Lair.
Plains // Battlefield Forge
$7.20
{T}: Add {C}.
{T}: Add {R} or {W}. This land deals 1 damage to you.
