Silent Magician Lv. 4

Each time an opponent draws card(s), put 1
"Spell Counter" on this card (max. 5).
This card has +1/+0 for each "Spell Counter" on it.
At the beginning of your upkeep, if you have 5 or more
"Spell Counter" on this card, sacrifice this card and
create one 8/3 hexproof "Silent Magician Lv. 8" token.