Bog of Castaway Elves

When Bog of Castaway Elves enters the
battlefield put the top two cards
into your library into your graveyard.
{t} deal 3 damage to you only if a bog elf
is in your graveyard:
add{u} or {b} or {g} to your mana pool.
Bog elfs cant be countered
Legend rule does not apply to
Bog of Castaway Elves.