That ability is "when the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost." This means that if for any reason a battle enters the battlefield without defense counters, it will be put into the graveyard and its controller will not get the chance to exile it
It is not quite the same as other card draw as well, much like the new Commune with Lava you only get one turn to play with the cards so you need to set up well for the event
If the player's field and GY is set up with these "Labrynth" cards, removing a single monster with a Normal Trap can trigger all of these Trigger Effects at once, generating a massive amount of advantage
His original Deck mostly composed of low Level EARTH and DARK monsters, which he supplements with Magic Cards to perform effective combos
this isn't another "blink" spell
This legendary enchantment-land duo is great for giving you a boost in the early game