the spilled drink
For more continuous effects in white, youd be looking at creatures and effects that want battlefield presence
For better or worse, you are included within this count of everybody, however, the disruption is typically still worthwhile
While the "ease of flipping" category is, in large part, a product of the number of defense counters on the battle (battles range from three to seven defense counters, and a battle with three defense counters will be much easier to flip than one with seven), it also takes other factors into consideration, like whether the battle makes creatures (if so, we can use them to help defeat the battle, making it easier to flip) or whether the battle acts as removal (which can get a blocker out of the way, making it easier to attack and defeat the battle)
Mana Crypt On every MTG banlist except for Commander (it's also only Restricted in Vintage) Mana Crypt is an absurdly strong MTG mana ramp card