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Not only does it create a 5/5 Horse at each end step if you gained life, but all your other horsestokens includedgain indestructible

4 Pete - Games Referee 195/204, Steel Pete - Games Referee isn't a card that's going to win a game on its own, but it could certainly stand in the way of losing

Spells are never mana abilities, regardless of effect

Both cards have the advantage of being reasonable to cast without any shenanigans, and both curve up from Tezzeret the Schemer very nicely

I might consider adding some draw strength like Dangerous Wager or Magmatic Insight to supplement this, and keep you dropping artifacts on your opponents at a dangerous pace