The downside is that your opponent gets to search their library for a land card, which goes onto the battlefield tapped, but in mid-to-late game situations, this isn't too much of an issue
Murktide Regent A very powerful dragon Murktide Regent is a seven-mana Blue 3/3 with flying that gets a +1/+1 counter on it whenever an instant or sorcery leaves your graveyard
Card Set(s) -THE TIME OF BATTLE- [OP-16] CARD VIEW OP16-035 | C | CHARACTER Roronoa Zoro Attribute Slash Block Icon 5 Effect [On Play] Rest up to 1 of your opponent's cards
Doubling Season says that you put double the counters whenever you would put counters on a permanent
While we always try to be as forthright as possible with the details of what you can find in our products, we have left some mysteries in the cards for you to discover on your own
Original Duals So, they tap for two colours of mana from turn one and they basically present no downside for doing this