Fungus Spores poison on spawn

[Turlututu]

I was playing in Arena 1 against a Fungus + Dry Spell deck, and apparently spores poison the opponent when they spawn? Is that a bug or a hidden feature?

See replay in spoiler box.

Spoiler for Hidden:

{"date":1659201853974,"seed":1293632268,"players":[{"idx":1,"name":"Turlututu","user":"Turlututu","deck":"066qt056ve066u30174g017b1017kg027n9067q9018090180i018pq"},{"idx":2,"ai":1,"name":"Jesith","deck":"0359e065ce015c3015cg0b5jm065ij015ir015io018pn055ia","hp":140,"drawpower":2,"markpower":2}],"moves":[{"x":"accept"},{"x":"accept","c":0,"t":0},{"x":"cast","c":10},{"x":"end"},{"x":"cast","c":49,"t":0},{"x":"cast","c":80,"t":0},{"x":"cast","c":50,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":19},{"x":"cast","c":26},{"x":"end"},{"x":"cast","c":67,"t":2},{"x":"cast","c":33,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":17},{"x":"cast","c":26},{"x":"cast","c":30},{"x":"end"},{"x":"cast","c":74,"t":0},{"x":"cast","c":56,"t":0},{"x":"cast","c":88,"t":0},{"x":"cast","c":79,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":18},{"x":"cast","c":30},{"x":"cast","c":29},{"x":"end"},{"x":"cast","c":104,"t":0},{"x":"cast","c":105,"t":0},{"x":"cast","c":59,"t":0},{"x":"cast","c":53,"t":0},{"x":"cast","c":54,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":29},{"x":"cast","c":3,"t":29},{"x":"end"},{"x":"cast","c":96,"t":0},{"x":"cast","c":107,"t":0},{"x":"cast","c":109,"t":0},{"x":"cast","c":108,"t":0},{"x":"cast","c":110,"t":0},{"x":"cast","c":38,"t":0},{"x":"cast","c":93,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":29},{"x":"cast","c":12},{"x":"cast","c":5,"t":29},{"x":"end"},{"x":"cast","c":112,"t":0},{"x":"cast","c":114,"t":0},{"x":"cast","c":116,"t":0},{"x":"cast","c":118,"t":0},{"x":"cast","c":120,"t":0},{"x":"cast","c":113,"t":0},{"x":"cast","c":115,"t":0},{"x":"cast","c":51,"t":0},{"x":"cast","c":117,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":29},{"x":"cast","c":14},{"x":"cast","c":28},{"x":"end"},{"x":"cast","c":100,"t":2},{"x":"cast","c":99,"t":2},{"x":"cast","c":119,"t":0},{"x":"cast","c":77,"t":0},{"x":"cast","c":76,"t":0},{"x":"cast","c":121,"t":0},{"x":"end","c":0,"t":0},{"x":"cast","c":27},{"x":"cast","c":28},{"x":"cast","c":16},{"x":"end"},{"x":"cast","c":89,"t":0},{"x":"cast","c":64,"t":2},{"x":"end","c":0,"t":0},{"x":"cast","c":11},{"x":"cast","c":27},{"x":"cast","c":6,"t":27},{"x":"end"},{"x":"end","c":0,"t":0}]}

[serprex]

That's intended, see card text of spores

[Turlututu]

Ok, good to know.

Spore's text says nothing about this, FYI.