A Vincent inspired card

[JackThompson400]

Vangogh, Insane Whirl Swordsman: Level 4 WIND Warrior-Type
Non-Tuner Effect monster 1900 Attack and 800 Defense


During either player's turn, when a monster(s) would be Summoned, OR when a Spell Card, Trap Card, or monster effect is activated that includes an effect that Special Summons a monster(s): You can send this card from your hand to the Graveyard; Select up to 5 Spell and/or Trap cards from the Graveyard(s) and banish them. During your turn, except the turn this card was sent to the Graveyard: You can banish 1 Trap card from your Graveyard to Special Summon this card from your Graveyard. You can only use 1 "Vangogh, Insane Whirl Swordsman" effect per turn, and only once that turn.

[Trebuchet MS]

I don't seem to understand why this card's first effect has an effect that's largely unrelated to the activation condition.

[JackThompson400]

I don't seem to understand why this card's first effect has an effect that's largely unrelated to the activation condition.

Also, wanted to do a thing that would support "Steadfast"/Semi-Monster Mash.