He is weaker than the former, a 2 in strength to Simbas 4, but tougher than the latter, a 4 in willpower to Calhouns 2
Improvements + Cards To Drop Trade for more of the good cards you already have
If your deck does not have access to green, you might have to get more creative by using cards like Tithe, Pilgrims Eye, or even Demonic Tutor to put lands into your hand, cards like Mana Geyser, High Tide, or Caged Sun to get a big payoff, or mana rocks like Arcane Signet, Coalition Relic, and the Ravnica Signet cycle (Boros Signet, Izzet Signet, etc.) to speed things along at the risk of seeing them destroyed later
Getting an immediate 4/4 Lifelink with Vigilance for is already strong, but what really pushes Batterskull over the top is how difficult it is to answer cleanly
When paired with the ever-powerful Up the Beanstalk, the deck is capable of burning through resources while maintaining card parity