I built a [[Multani, Yavimaya's Avatar]] $50 budget deck a number of years back that is just a mono green spell slinger build. It is pretty simple to play for new people and resilient enough to play with my normal group.
Being a budget deck I even run it unsleeved and get that nostalgia of playing kitchen table magic as a kid.
@jake_eric
Any counter doublers or increasers with these two would go infinite if that is what you are looking to do.
For example with [[hardened scales]] on board you would pay one mana and tap the crypticfor two +1/+1 counters. Then you could pull both off for 4 mana and use 2 to untap and one to activate again.
[[Hivestone]] is a sliver specific ability to convert all creatures into slivers. [[Artificial Evolution]] is also a fun option for changing a creature type on a spell or permanent into something else.