I didn't get into the various Maskwood Nexus shenanigans one might get up to with a deck like this, but I'm sure there's something degenerate I could do with the right inspiration
You can't do so later in combat, and creatures put onto the battlefield attacking can't be exerted
Every Forest , Island , Swamp , Mountain , and Plains has an intrinsic mana ability
Magic has been making shiny (foil) versions of their cards since 1998, and its been a core part of this games addictive appeal ever since
The Harbinger should, obviously, only be played in mono-blue Merfolk decks, and preferably in control shells that focus on icing out the opponent from doing much of anything rather than overwhelming them with tons of creatures, just like Richard Garfield intended
What is more, overloading Vandalblast comes with no risk, since this card will not affect the caster's own artifacts