Mox Diamond [Stronghold]Set: Stronghold Type: Artifact Rare Cost: {0} If Mox Diamond would enter the battlefield, you may discard a land card instead. If you do, put Mox Diamond onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add one mana of any color.

return it to its owner's hand

Set: Portal Three Kingdoms Type: Sorcery Common Cost: {B} Return target creature card from your graveyard to your hand

destroy it

I think 'toast' is an appropriate description

Set: Premium Deck Series: Graveborn Type: Instant Rarity: Rare Cost: {B} Search your library for a card and put that card into your graveyard

"In the drowsy dark cave of the mind

sacrifice Conversion unless you pay {W}{W}

this spell costs {6} less to cast

Set: Dominaria Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {0} {T}: Add one mana of any color among legendary creatures and planeswalkers you control

Set: Planar Chaos Type: Legendary Land Rare Cost: Each land is a Swamp in addition to its other land types

Viridian elder

{T}: Look at the top four cards of your library