Dweldian magi don't enter the Realm of Thrones when they die. Instead their souls are drawn to great works of magic.

Storm Entity

Haste
This creature enters with a +1/+1 counter on it for each other spell cast this turn.

Dominaria Remastered

Haste
Storm Entity enters the battlefield with a +1/+1 counter on it for each other spell cast this turn.

The List

Time Spiral Remastered

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Future Sight

Haste
Storm Entity comes into play with a +1/+1 counter on it for each other spell played this turn.

The number of other spells cast this turn is determined as Storm Entity enters the battlefield. It will count spells that were cast while Storm Entity was on the stack. It will not count copies of spells that were created directly on the stack.