Plaxcaster Frogling

Graft 3 (This creature enters with three +1/+1 counters on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.)
{2}: Target creature with a +1/+1 counter on it gains shroud until end of turn. (It can't be the target of spells or abilities.)

Commander 2021

Graft 3 (This creature enters the battlefield with three +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
{2}: Target creature with a +1/+1 counter on it gains shroud until end of turn. (It can't be the target of spells or abilities.)

The List

RNA Guild Kit

Modern Masters 2015

Dissension

Graft 3 (This creature comes into play with three +1/+1 counters on it. Whenever another creature comes into play, you may move a +1/+1 counter from this creature onto it.)
{2}: Target creature with a +1/+1 counter on it can't be the target of spells or abilities this turn.