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719.3a: To solve [Condition] means At the beginning of your end step, if [condition] and this Case is not solved, this Case becomes solved. 719.3b: Solved is a designation a permanent can have

As a bonus, sometimes this is going to buy you a crucial turn against spellslinger decks that can't fully go off at instant speed or their upkeep or whatever

In fact, it was recently a meme in the Yu-Gi-Oh fandom that normal summoning Aleister was always the start of any combo

I wouldn't use more than 1 one of these in a deck on its own, because the retreat cost and only move Spheal has require two energy cards, so the card is slower to use, but with 70 hp, early on in the game it would be able to endure a couple of attacks while getting energy cards attached to it