Tengu format ruling
Lucky Chance

Card effect (current official text)Once per Chain, if a monster effect is activated that tosses a coin once: Call heads or tails. If your call matches the coin toss for that monster effect, draw 1 card immediately after that effect resolves.
Rulings
- Lucky Chance's Trigger Effect is chained to the effect of the Effect Monster. You choose what you think the coin flip will be when you resolve Lucky Chance's effect.
- If you control 2 or more face-up Lucky Chance, you will only call the coin toss once and you will draw 1 card if you call it right.
- If you use the effect of Second Coin Toss to re-flip the coin, you do not reselect for Lucky Chance.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.