It won't turn any land into a basic land or remove the legendary supertype from a legendary land, and the lands won't be named "Island." If Harbinger of the Seas loses its abilities, it continues to turn nonbasic lands into Islands
In the future, I think this step could be improved by adding more specific and actionable advice about what makes good cards, like the guidance from this page
The Mox Emerald above , from the Alpha printing, sold for $18,000 / 12,700 via Heritage auctions in 2021
When Purphoros enters the battlefield, your devotion to its color (including the mana symbols in the mana cost of Purphoros itself) will determine if a creature entered the battlefield or not for abilities that trigger whenever a creature enters the battlefield
Is the straight-to-Modern pipeline a good one for sets
Based in Holland Shipping to all Eurozone countries Magic Final Fantasy Commander Deck Limit Break (VII) 84,50 84,50 Based on the game Final Fantasy VII Embrace the power of Cloud and the AVALANCHE team in this Naya (Red-Green-White) deck focused on equipment and high-powered creatures