Crystaline Mantis

Flying
{s}, {t}: Create an ice shard token. (It's a snow
artifact with "Sacrifice this artifact: Target snow spell
can't be countered this turn.")
{1}{s}{s}: Whenever a snow permenent enters the
battlefield under your control this turn, target
snow creature gets +2/+2 and gains trample until
end of turn.
{4}{s}{s}: Put a +1/+1 counter on each snow
permenent you control.