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Poker is not pure gambling, but what gambling poker has is unskillful:
DN31:11.2: Victory breeds enmity. The loser mourns their money. There is immediate loss of wealth. A gambler’s word carries no weight in public assembly. Friends and colleagues treat them with contempt. And no-one wants to marry a gambler, for they think: ‘This individual is a gambler—they’re not able to support a partner.’
Beyond gambling, poker incorporates some measure of proficiency in "reading tells". Unfortunately, poker also involves deceit and strategies such as "all in" for betting, which is definitely unskillful for a Buddhist perspective.
MN117:29.1: And what is wrong livelihood? Deceit, flattery, hinting, and belittling, and using material possessions to pursue other material possessions.
Please reconsider your livelihood here, especially if you donate gains. Such gains can only be purified by the recipient, not the giver.
AN4.78:3.1: And how is a religious donation purified by the recipient, not the giver? It’s when the giver is unethical, of bad character, but the recipient is ethical, of good character.
Practice the Noble Eightfold Path to benefit yourself before you seek to benefit others.
AN4.95:2.2: The person who practices to benefit neither themselves nor others is like this, I say.
AN4.95:3.1: The person who practices to benefit others, but not themselves, is better than that.
AN4.95:3.2: The person who practices to benefit themselves, but not others, is better than both of those.
AN4.95:3.3: But the person who practices to benefit both themselves and others is the foremost, best, chief, highest, and finest of the four.
In the above, "practice" is right practice according to the Noble Eightfold Path.