You don't get to immediately change the board state, and it's most likely turn four, a point where both you and your opponent have already invested in whatever your cards in hand could have done
There are also Shop tickets, which you can use to purchase items in the in-game store
Mana Echoes Like Molten Echoes, this is also nuts with Siege-Gang Commander, seeing as youll generate a ridiculous amount of mana
Ignoring the Ban List The Forbidden and Limited List (commonly known as the ban list) restricts the use of certain Yugioh cards to maintain game balance
This pretty much puts a blanket ban on all of your opponents monster effects, which is incredibly difficult to out
Unfortunately, this also means that blues methods for mana ramp really arent all that well defined, resulting in a very limited pool of cards to choose from without adding other colors, many of which are also mechanically unique