Seamus, Winter's Wrath

When Seamus, Winter's Wrath enters the battlefield for the first time on a turn, tap two creatures target opponent controls. Those creatures don't untap during their opponents end step as long as Seamus is on the battlefield.
{t}{g}: Put a +1/+1 counter on target Beast or Plant creature you control.
{t}{b}: Put a -1/-1 counter on target non-Beast, non-Plant creature your opponent controls.