Grove of the Guardian

{T}: Add {C}.
{3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice this land: Create an 8/8 green and white Elemental creature token with vigilance.

GRN Guild Kit

{T}: Add {C}.
{3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice Grove of the Guardian: Create an 8/8 green and white Elemental creature token with vigilance.

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Return to Ravnica

{T}: Add {1} to your mana pool.
{3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice Grove of the Guardian: Put an 8/8 green and white Elemental creature token with vigilance onto the battlefield.

Return to Ravnica Promos

To activate Grove of the Guardian’s second ability you can tap any two untapped creatures you control, including ones you haven’t controlled continuously since the beginning of your most recent turn.

You can’t tap Grove of the Guardian to activate both abilities at the same time.