Ancestral Summoner

When Ancestral Summoner enters the battlefield, you may exile a white or blue instant or sorcery card from your hand with four time counters on it. If you do, it gains suspend.
{x}{w/u}{w/u}: Exile a white or blue instant or sorcery card from your hand with six minus X time counters on it and it gains suspend.
"Call upon your elders for wisdom, foolish boy."