Fetching details from the dictionary...
capsule toy; vending machine toy
gacha; loot box; loot crate; system of selling random in-game items in video games (similar to how capsule toys are sold)
lottery (i.e. something decided by chance)
ガチャで欲しいキャラが出た。
I got the character I wanted from gacha.
ガチャの確率が低すぎる。
The gacha odds are too low.
無料ガチャを毎日引いている。
I do the free gacha every day.