Overall, Id recommend double-sleeving your cards, it greatly improves their protection and perfect fit sleeves arent too pricey
If they don't mind the cost of playing Green, the ability to ramp up mana without putting a vulnerable creature into play or casting a sorcery-speed card to get that mana means that it is possible for a Blue-based control deck to never put the shields down
Your ping time can literally be the difference between winning and losing
As Scott points out, its good to have a plan for players making oodles of treasure
However, as the ability tries to resolve, if you dont control seven or more lands, the ability fails to resolve and the effect doesnt happen
Making effective use of discard spells means sequencing and timing your strikes to leverage that information advantage