Untouchable should prevent any effects from touching a card both allied and opponent's.
Lanstead ignores this restriction.
This creates an abusive, buggy interaction where the only counter is Pras, The Traitor Of Dawn. Opponent can use Lanstead and sometimes Junkyard at minimal cost to drop Unstoppable/Flight and 64/64 on any spammed token creature they want. Even if you counter appropriately with field clears you have the same issue two turns later. If the location is destroyed the opponent can just revert back to the normal Logarithmon strategy which is already excessively difficult to counter to start with because of Untouchable. Games WILL end by turn 6-8 and the opponent can't defend which means you're back to flame dawn to win first.
Please double check if Lanstead should be able to use an untouchable source card to drop stats on everything else. This would be a legit deck if untouchable weren't present.