This could be a classic on the level of All Sun's Dawn
Number 109 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (6/15/2010) Training Grounds won't affect a cost that isn't the cost to activate a creature's activated ability
What if this was a split card: you can pay 4 mana to gain 3 life and then you can pay XX to create X food tokens
The other cards are sweet, but I particularly like that The Spear of Leonidas has three choices when you attack with it, including summoning Phobos, a legendary 3/2 red Horse creature token
Both Violent Outburst and Shardless Agent are the backbone of every Cascade deck being played in Modern nowadays, and currently there are two tier 1 decks (Living End, Crashing Footfalls) cascading into powerful spells to win the game
Path to Exile is the optimal removal for the deck (especially since we can sometimes eliminate the downside of giving our opponent a land with Leonin Arbiter), but Declaration in Stone is a fine budget replacement with some upside against token decks since it exiles all copies of a creature