What makes Witherbloom so strong is that it can be cast at a huge discount
Not only do these cards provide absurd amounts of value, but as long as they're in play, their controllers will be required to continuously ask the rest of the table if they'll pay the card at hand's tax when applicable
Secondly, and this mostly applies to older cards, mainly 4th Edition , there are extremely rounded corners similar to the Alpha set
Once theyre evolved for a few turns, youre playing with your deck in your hand
After all, your targeted discard gives you unparalleled information to work with regarding your opponents hand but you dont have the luxury of simply vetoing the mana they spend each turn by countering spells on the stack
Once per turn, during either player's turn, when a card or effect is activated that would destroy a card(s) on the field: You can negate the effect, and if you do, destroy it