To deploy a card in -mgbmix- means to bring it into play.
The following are several rules to keep in mind about deploying.
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To deploy a card from one’s Hand usually requires paying its Funding Cost, however there may be times when rules text reads “You may deploy this card without paying its funding cost…” One example of this is playing a Challenge card in Free Contest mode.
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A card may be deployed from elsewhere than one’s Hand, such as if it was temporarily removed from play, or if it enters play from another area such as the history or the newsfeed. In these cases, the funding cost is ignored.
Magic: the Gathering connection
‘Deploy’ can be considered the equivalent to ‘cast’ in MtG parlance, though the two are not identical in their details.