Portal Elemental

Portal Elemental enters the battlefield with X
+1/+1 counters on it
Remove a +1/+1 counter from Portal elemental : create a blue Portal artifact token with
" {3}{t}: target creature can't be blocked this turn"
and "{3}{t} sacrifice this artifact : prevent all combat damage that would be dealt to target creature you control this turn"
{x}{x}{t}: put X +1/+1 counters on Portal Elemental.