Ria Ivor, Bane of Bladehold Ria Ivor, Bane of Bladehold is a bit unusual as an infect commander because it doesn't immediately put poison counters on your opponents
Classic options like Llanowar Elves and Elvish Mystic slowly growing are fine with Tyvar, but what about the elves that tap for lots of mana
Kydele, Chosen of Kruphix Kydele, Chosen of Kruphix wants card draw to give you more ramp, but in practice you often need the reverse, ramp first, then card draw
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They all can cost four mana if you want them to
Village Pillagers, meanwhile, comes down in the mid-game to help you keep pushing your engine toward inevitability