While there are other cards that can inflict poison counters, such as Tainted Strike or Ichor Rats, the effectiveness of this card largely depends on the overall strategy of the deck and the meta
Raikou V is an Electric-type card that is strong against Lugia VSTAR, Arceus VSTAR, Kyurem VMAX, and Palkia VSTAR
Never store cards loose or stacked without protection, as even minor damage can significantly reduce their value over time
The general playstyle of Curse of Dragon monsters ties them to the "Gaia The Fierce Knight" archetype through most of its members directly supporting "Gaia the Dragon Champion", cards that support it, or the archetype of the same name
they might never get any more turns
Whether it triggers immediately, is only active when there is one underneath, or relies on having a certain number in the stack, there are a lot of different ways to use this new way of paying a cost