Omnath, Locus of the Roil [Core Set 2020 Prerelease Promos] Onslaught Players can't cast spells during

Players can't cast spells during combat

you may exile a blue card from your hand rather than pay this spell's mana cost

Set: Tempest Type: Enchantment Rarity: Rare Cost: {1}{G} Tap an untapped creature you control: Untap target basic land

Set: Beta Edition Type: Enchantment Rarity: Rare Cost: {R}{R} At the beginning of each player's upkeep

Set: Alpha Edition Type: Sorcery Rarity: Common Cost: {B}{B} Destroy target land

Omnath, Locus of the Roil [Core Set 2020 Prerelease Promos] Onslaught Players can't cast spells duringSet: Core Set 2020 Prerelease Promos Type: Legendary Creature Elemental Rarity: Mythic Cost: {1}{G}{U}{R} When Omnath, Locus of the Roil enters the battlefield, it deals damage to any target equal to the number of Elementals you control. Whenever a land enters the battlefield under your control, put a +1 +1 counter on target Elemental you control. If you control eight or more lands, draw a card.