Opportunity

Flash (You may cast this spell any time you could cast an instant.) When this creature enters, choose one — • Untap target permanent you control. • Tap target permanent an opponent controls.

XR: This turn, creatures can't block unless their controller pays X for each blocking creature they control.

When this enchantment enters and at the beginning of your upkeep, choose left or right. Each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent.

1, Exile two creature cards from a single graveyard: Create a 1/1 green Saproling creature token.

T: Each player draws a card.

This land enters tapped. T: Add B or G.

Whenever you gain life, you may pay X, where X is less than or equal to the amount of life you gained. If you do, draw X cards.

When this enchantment enters, you may exile target artifact or enchantment. At the beginning of your upkeep, you may exile target artifact or enchantment. If you do, its controller gains control of this enchantment.