Solemn Simulacrum doesn't look like much at first glance, but the combination of his effects creates a large swing in your favor, netting an extra land, a smoothing of colored mana, an extra land play, and replacing the card when it dies
In theory, you can also dip into +1/+1 counter strategies to buff your creature tokens, then copy those using Populate, further increasing those lifegains
For just two mana you can start making Egg creature tokens
This is so strong
Hellkyte Tyrant : Trample makes it deal damage to a player much more easily, and if you steal a bunch of artifacts, you can use them to boost Hellkite Igniter
So How Many Lands AND Ramp Spells Should You Have in Your Deck